not bad :3 did you do these with the mouse? o.o if so, forget what i'm about to say.
the only thing i see wrong in the art itself is the squiggly lines. but..if you did that with mouse, it's hard to avoid >_O so...yeah
and one more thing: when you save a picture as a jpg/jpeg, go to "options" and make the quality really high (that way there won't be any fuzzy lines)
for some art programs it's different.....so, there might not be an options button.