Your works are colorful and nice. I see from your pictures that you are a very sustained artist but if you want to procede and get better with characters then i would highly recomend you to study anatomy and construction. If you just start drawing or painting without knowing the exact shape then everything will tend to look crooked, even if you are just copying a picture. If you want to make enviroment or hard surface art then you should learn to use perspective right. also your colors look in some pictures really psychodelic or like the default colors from ms paint, so make color studies. if you practise those things then you will become a much better and independent artist. hope, this helped..