It is a good start for someone who doesn't know how to draw.

I like the design of the character
With cartoons it is all about style so it is hard to tell if you made the mistake or if it is intended.
Anatomy comments
http://fineart.sk/show.php?w=914
If you go to the link above you will see some simple drawings of a male anatomy.
A few things stand out to me. Keep in mind that I know this may have been an artist choice. The legs a very long on your character. This makes his torso seem to short.
His neck seems to short and the right shoulder (his right) could come out to the left a bit more.
You mentioned the hand but did you notice that the muscles on his left forearm are bulging out on the wrong side?
last thing, it may be my computer but it looks like he has red-ish colored lips. My anime men don't have colored lips. But as I said it is all an art choice.
Hi animation world.