A premature digital sketch

For this project, a website graphic for a biotech company's homepage, I needed to get a draft made in 3 hours or less total. Because I didn't think a pencil sketch would give them a very good idea of what the final product would look like, I had to move to the computer pretty quickly after a few cursory thumbnails on paper. So I wound up with something that looks like it could be a finished product, but a rather poor one, since both the composition and colors need some work. So now my sketchbook is like, "See? I told you so." And it's right. But the clients know that this is just a "sketch" so it's okay. I'll probably go back to the sketchbook before moving on with it. That is, if it'll have me.