Looks fine to me, if anything the ceiling is a little on the blue side (to me)
Joe, that strange shadow you see, I see the same thing in my house when I shoot. In normal light or with the on board flash you don't see it, but when under a powerful flash like the SB700 it shows up. Well that's my experience with it.
It took me a while to figure out what it was in my shots and I bet it's the same thing here. The shadow you see on the ceiling is a dry wall seam, also if you look around the edges of the walls at the ceiling you can see a shadow, too. That is where a flat edger or paint brush was used during painting to "cut in the ceiling".
Pmillage, I'm not saying you have a bad paint job, you have a beautiful room. but I think your speed light is just showing every small detail.
I'm not a flash expert, and I have not tried this yet, but if this was my photo I would try to cut down on my power on my flash so you don't see this effect.
Now at this point I'm going to bow out and let the flash experts take over on my guess here and maybe offer advice.