looks good to me. but you really should start using sharp edged brushes. they give the impression of much more solid and self-confident brush strokes then those blurry brushes.
an example:
[Blocked Image: http://itchstudios.com/psg/tuts/bad.jpg][Blocked Image: http://itchstudios.com/psg/tuts/better.jpg]
really nice work none the less