You do have some potential, but you definitely need practice, as you stated yourself, especially on the hands. Anatomy also needs some work - The arms are way to short, esp. on the first picture, and the bodies in general are in incorrect proportions to the head. Just remember that the head has to fit seven times into the body, approx. Also, your shading can be improved a lot. The second one is colored extremely flat- Maybe that's your thing, but try to work more with saturation and really darkening where shadows ought to be! The first is better regarding that, but still really flat. The shadows rarely fall realistically and the light areas are really flat and strong as well- As I've said, flat coloration might be your thing, but even that needs more shadows and in some cases even an increased number of outlines. You definitely have to work on the facial proportions as well- In the first, it's mainly the eyes, in the second, though, the line below the lips seems weird, the nose is almost too simplistic. Try working from references, even if you aim at a sorta cartoony style, it does wonders. As I've said, you've got potential, so keep on practicing!
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