hmm... Some of the lines could be fixed. There's alot of zig-zags in the single-pixel lines. Trim them. Take out the extra pixel in those spots so the lines don't look like zig-zags.
Other than that, the pic looks good. Very interesting-looking character. And because he's not human (assuming), he can get away with not having normal human proportions.
After a little clean-up, your pic would so be worthy in the line-art thread.