For a first attempt its good
i've neved gone near editing forum themes.
Its nice and subtle, just match the top (control panel menu bar bit) so it matches the lower colours nd it will look good
Top header pic just needs a touch more blending to make it match the back ground.
Personally i like it
nice and simple, if i had vb i'd go for that as its nice and simple and is not harsh on the eyes.
Good Job