(First of all, here's my new conceptart.org sketchbook: www.conceptart.org/forums/show…
I will try to update it more often than my DA, with sketches and WIP's since I think that DeviantArt isn't that suitable for it.)
I would give a little advice to all young artist who struggle with interpreting their idea. You know that moment, when you have some image in your head, it looks cool and everything, but when you put it down on paper it looks like doodle from five year old child ?
If so, here's the advice.
LEARN TO DRAW.
Seriously, try to measure angle and lenght of line carefully. There is plenty of tutorials online on how to do this. You will save your self a LOT OF hard time and you will improve rapidly if you will learn how to draw. Just take your time and don't be High and mighty, thinking that you already know everything.
That's all I wanted to say.