Hi Yudahkid12, well first of I'm glad to meet you, and I hope you find this place to be a warm and welcoming one, and the fellowship you find here to one that is loving, uplifting and supportive, and I do hope that all you find here is characterised by love, joy and peace in King Jesus
As to Jesus Himself, well according to the flesh He was born of Israel, of the Jewish people, and He is the Messiah of Israel, the expected and full Son of David (and His own favourite title, Son of Man, the one who represents Israel in person). Indeed as such this makes Him King of the Jews, the King of Israel (and therefore the world Psalm 2, Isaiah etc), so He is Jewish, and indeed (given He was born in Judea - Judah) He would look Middle Eastern Jewish probably similar to Sephardic Jews (Jews who have remained in the Middle East).
However the above are right, as Israel's Messiah He is therefore the Messiah (the Ruler and Saviour of all the world), His was faithful and fulfilled Israel's calling in person, the point at which the long history detailed in in the OT, which God promised to deal with evil in the world and rescue creation from the effects on sin and evil through Abraham reached it's climax, in and through the Messiah (by being the curse of exile and death) forgiveness of sins for Israel and release from exile was released and at last was achieved the purpose to which Israel had been called, elected and blessed to both belong to God and therefore to be the ones through whom the nations would be blessed, redeemed and freed, and all creation would be set free from it's bondage. And this was achieved by Jesus being Israel in person, taking it's identity and calling in person, taking the curse of exile fully on Himself, and so unleashing the forgiveness of sins, the final return from exile, blessing and freedom promised at last, to Israel and all mankind bringing the promise to Abraham to fulfilment. In His own flesh He broke down the barrier of the dividing wall between Jew and Gentile, abolishing in His flesh the enmity between Jew and Gentile. So what counts now, what justifies and makes one whether near (a Jew receiving the promise) or those far off (Gentiles, the nations) a member of Abraham's family, with covenant right to the table is faith into the Jewish Messiah, and in His faithfulness on our behalf alone that counts now, and not the works of circumscription, food laws etc that justifies and makes us of Abraham's family and receive the blessing and promise of (and given eschatologically to) Abraham. Believing faith into (and through) Jesus the Jewish Messiah to Jew and Gentile alike alone is what makes one of the commonwealth of Israel (just to not this has nothing to do with Israel as a country, and I do read Romans as promising the full restoration of ethnic Israel in time to recognise and claim the promise that is theirs through the patriarchs, the prophets, their ultimately their own (and our
) Messiah who has fulfilled those promises and ended their exile, the blindness affecting most of the Jewish people will end, God is faithful to His promises
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So as the Messiah of Israel He is the Messiah of the whole world, it's Saviour and true Lord, and the one through Whom all nations and the world shall be saved, rescued and restored.
So He is and remains the Jewish Messiah, but because of this, in it's fullest meaning and the intention of God from the beginning to rescue all of mankind and the whole world through His calling of Abraham, He is the world's Messiah. So in terms of how people depict Our King in artwork, though I always have a personal preference from a Middle Eastern Jewish depreciation it is not only fine but equally true to depict Him in the style of their own culture and style, as He is the fully human One, the one in which all the nations as who each uniquely is is restored to be fully themselves, fully their own culture while being joined through the Lord into the commonwealth of Israel. And of course, throughout the resurrection narratives we see through them the strangeness of the new resurrection body, as it has been correctly surmised it was as if the authors and the eyewitness narratives behind them were attempting to describe something for which they didn't have adequate language for, the first example of incorruptible, immortal new creation in existence. The first-fruits and the launch of what is to come to all redeemed humanity, and indeed to the whole universe, as the whole cosmos was made through Him, so it is and shall be redeemed, rescued and restored through Him, and brought under His saving and restoring Authority
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And so it is because He is the Jewish Messiah, that makes Him the world's Messiah, it's Lord and Saviour, the one through Whom the whole world has been, is being and while be saved, rescued, restored and renewed, and all the peoples in their diverse and unique multitudes (in all their beautiful distinctiveness now in unity in Him) set free, the ones through whom His reign will be exercised. So by because He is the Jewish Messiah He belongs to all nations, and they belong to Him, and is the universal Saviour of all.
Anyway, I hope you find many more discussions on the issues you have, and find understanding and compassionate responses and engagement
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God bless and Welcome