The legs kind of look like they are floating. If you wanted to let it look like he's sitting the feel should have been bigger and more forward..
The three fingered hands are kind of a pet peeve of mine, but the drawing still looks cute <3 Also I love the way you drew the glasses.
Overall, it's adorable.
The jaw seems majorly misplaced. It should tip inward quite so much. Also the mouth should have been a little bit more to the left. Remember that a mouth is right under the nose, even if he's pulling it like that ><
What I do like is the hair and eyes. The eyes are really dark and well shaded in my opinion. Hair has always been kind of my thing so I pay a lot of attention to it and I like the way you did it here.
The hair is actually not that bad here.
The (my) left hand looks like it has three fingers O_O There should have been more tips showing unless you were going for the alien look xD Which is cool with me. also you could have added a bulge in the pocket of the shirt where his hand is and the hand should have been thicker. I am not sure if you were going for the wrist or the hand that is just sticking out between the end of the sleeve and the pocket, but it looks like it should have been the hand and its waaay to thin in comparison with the (my) left hand.
What I do like is the overal clothing and the feet. I'm missing the eyebrows, the brow seems too empty, btu the rest of the head is good too.
first off the underarms. If you are going for the rounded look go for it on both sides. Now it looks with the top going inward and the bottom going outward that there's something wrong with her arms. Also, you need a little bit more of a wrist.
The (my) right leg seems way thinner than the left one, and it should have been the thickness of the left. The left foot also seems off. Skirt also seems to be a bit too uni-length with the folds.
Once again I like the hair and the jacket. I like her expression too =]