Hi there Sekator,
There are a lot of things that you need to work on. You art is at an early stage and you require a lot of knowledge before you can design a proper character. First thing is first, Anatomy, probably the biggest pain in art. Look it up, and look for tutorials online, we even have some here on MT. Focus on one thing at a time, that way you won't get overwhelm with practice.
Check it out and keep practicing mate ;D