Cute :D I like it

I liked very much the childish style of this draw, also, the way you used light instead of shadows and the bright background did the trick in making this picture very friendly, matching well with the characters!

Ah, at the same time, in this version of Finn and Jake they are cute but somehow managed to keep adventurous. I guess it's because they are looking very enthusiastic. :P

This version of Finn looks younger. Your style follow a bit more traditional cartoon look, as a posed to Pendleton Ward's.

Nice , really digging the lighting.