hmm i'm a beginner so critiques are welcome.

fill in the word bubble with a color?
some color in the robot?
cause there's too much white.
overall, it's great. :]

i agree with not enough color.
it's okay, but there have been a lot of submissions to threadless that are similar to this. the shape of the robot. a heart somewhere.

http://threadless.com/product/68/She_Doesnt_Even_Realize

same shape body. heart in the chest region.
just not original enough.

just to let you guys know, this design started out as a doodle way before i even saw that design. so it's not like i copied it or anything.