hm since the first post, and after all these pages, I thought you would of improved more than you have.
I guess its not too bad as the thread is under a year old and you've been having a go at everything. my advice is if you're serious about art, pick one aspect and practice your ass off, you have good productivity and by the time you're 17-18 you should be at a decent level, if you just like it as a hobby then by all means carry on experimenting. Theres nothing wrong with experimenting, its what i did when i was about 12-13, I used to do logos, graphics, mock up websites, as well as painting and drawing and I feel that the lessons I learned from all these areas benefited each other.
ill post a look back at my own progression, might inspire you or something :P