haha, here's my critique(and let's hope my coding works);

Positives
-I love your designs, pallete and style.

-You have a neat and unique signature

-the art is reasonably proportional

Negatives
-The top lip shouldn't jut out so far though, and the ear has a stray line.

-The line-art is a bit fuzzy, maybe try using a smaller brush or erasing around it.

-you should also try using a bigger canvas because the art is a bit pixally, then the design and line-art would come out smooth

-another suggestion is to scale your signature smaller because as I look at the art my eyes dart back-and-forth

-and yet, one more suggestion is to not draw a line where the head ends, it looks like his head was cut off-you should try to make the color slowly faint out