Alright, lemme try.
So, first of - very nice job on the face. I really like it, it's expressive, looks cute and appealing, and you've got really nice symmetry going on with the eyes. Definitely, it's the focus here.
But, I have to say, his body looks very stiff. I encourage you to start studying anatomy - yes, it's useful even when drawing chibis. His body lacks shape and fluidity and his pose is very... dead. I assume you were going for a "shy" pose, but even then the body should be a bit more expressive. It mostly looks rigid because you've used straight lines, and unless one's going for very heavy stylization, human body tends to have many curves. And that's very useful for chibis too, since they tend to look baby-like, and babies are indeed very round creatures.
Also, clothing folds. So far, the drawing lacks shape and form because everything except the face is straight lines. Since limbs are rounded, the clothing around them should be as well.
But overall, it's pretty cute, and you seem to have a knack for drawing adorable faces, so if you practiced anatomy, posing and clothes a bit, I think you'd make some really nice, solid chibis. Good work and keep drawing and learning.
