well, if you wanted to make it lineless and neat, you could do it WITH lines, then erase them afterwards, but i have the feeling you probably did that already >.=.> but yeah, it give the piece a unique look to it. Quite appealing really
Naw it was colored parts placed and shaded on a pencil sketch. I've never done it quite this way before so I'm glad it came out well enough for you to like it ^_^