There're 2 main styles of yours. I love both This one is anime and i just love how you do the shading and lightning. What did you use to do the lineart?
I guessed you use SAI. I think you have a tablet,right? You can use the pen tool. You can have different pressures using pen. At least I think most people use pen. I haven't try pencil yet. ^^ ah, use the eraser cleverly to make you line art cleaner.
I love this background