Hey! Was checking You out. Me by myself, have finished art school, so I think I have some kind of artistic knowledge laying on my shoulders. Look, You seem to have certain type of "strich"- those lines You make while sketching, but I do miss Your own way to express Yourself. Be brave. Also, whenever You want to sketch something in a more realistic way, try playing with shadows and light. If You want to emphasize certain form, try leaving some blank spaces next to completely dark-ones. Keep it up, You are doing just fine ;)