I can't see some pic in your page and any link to some other website for can value and help in your supposedly weak points.
Even if you starting or not, always help revise the basics. Study anathomy, copy of photo references, triying new mix colors could be help you. I ignore if you taked additional art study. If it's not in case, I suggest you for got a idea of how makes pictures. If you take some art study but you don't feel learn anything or improve, you can borrowing books in library for basics and inspire. In that case that you can't help the things that I said, maybe you have a deep reflexion of your method work and open your mind for leaning other system work (in deviant are a loooot of tutorials).
Some other advice can give you. The work could be look simple and the proportions are correct, but if the idea is good and transmit something, the work is good. Without stress, remember that you drawing for entertain.