they're more like they came out of your ass...ok sorry, that was rude; I guess my standards are too high. They may be good for your age, I don't know. But this shading style you practice really gets on my nerves. 90% of people use it because they don't know any better and maybe you think it looks cool, but it doesn't. All in all, they're just the average drawings you see everywhere, nothing spectacular, nothing good, nothing TOO bad, just...plain average.
sorry about that ass thing, it was the first thing that came to my mind when I read your post.
oh and your signature is nothing to be proud of.