Andy-H makes some good points there. The site looks fine for me, but you do have a case of a bit of burying if for example, you actually want people to see your artwork.
I also find that the navigation kinda disappears into the design. You only have 3 Nav items, so I'd make sure they are large and visible, perhaps with a bit of rollover eye candy. I don't know if you can get an updated screenshot for Robert's plumbing, but the empty boxes on the front doesn't reallly showcase your design skills. You might want to omit that one if you don't.