i really like the colors you used! in particular, for the skin. and i love his facial expression. he seems so unamused. it works for your style.
as far as critiques go, i would maybe make his legs a bit longer in proportion to his arms. either that or make his arms shorter; in proportion to the rest of his body, they (the one arm thats showing anyway) look sort of long.
also, the background is sort of scribbly, and i would have added other colors like maybe magenta or something to make him stand out or just to make it look more interesting, but like you said, you wanted it to be done quickly, which i understand.
all together this is good! your style is really cute. please keep it up :>