A Crush:
Being in Love:
...is a lot harder to find a picture for. One video I watched spoke about how we have a childlike experience of love being the fulfillment of our needs and desires...met with joy, patience, and selflessness. This is a love a child would experience from parents in a healthy family.
Being in (mature) love, as an adult, however, was the valuing and superimposing of someone else and their needs (etc) over your own. Finding someone who you're more interested in than yourself. Choosing them and lifting them up over your own thoughts, feelings, habits, etc.
So I would assume 'being in love' as most people mean it, is some strange mixture of the two where both people find their needs met while trying to selflessly prefer the other person over themselves. It's a mixture of feelings, choices, experiences, etc... that all create a unique situation that is popularly called 'being in love'.
Something like that...
...and just for fun...I had to post some sort of image under this part! ^_~