Well, here's my opinion on the bike, I'll try to be as constructive as possible and not flame:
1) Color scheme: I LIKE the gold frame, its completely different, and I even thought of doing it on my 750 build at one point. However, I feel it clashes with as bright of a blue that you have on the bike. Maybe a darker blue would have been better, as right now you have 2 bright colors that are both vying to be the focal point.
2) Graphics: I'm a minimalist so the graphics make the bike look too busy. You have a beautiful paint job there, the graphics seem to disrupt the flow. Just opinion, but it makes it look like you were trying to hard to get the bike noticed, when you didn't need the graphics. The frame/paint scheme should speak for itself.
3) Exhaust: I agree with Proteal that the tip at least looks throw together. Maybe a larger can pointed upwards on the 4-1 or a 4-4 exhaust with smaller drag pipes from under the bike would look better. The one large pipe cut off seems to just beg for a rodent to nest in it
Also, I don't like the black headers, they really don't match with anything on the bike. If you had a chrome set with a gray motor I think it would flow better. However, if you paint the heads black, then the black exhaust would probably work.
4) Seat: I need more cushion then that. Also, I see Proteal's point about the flow. If you look straight across from the "shoulder" of the tank where it is flat (stay with me), the boxed portion of the seat is higher then that of the tank "shoulder". Your eyes have to readjust up to that point before following the curve of the tail. If it was even with the "shoulder" your eyes could follow from the front of the bike to the back without ever having to jump between curves.
5) Tank: I liked it better before you put the floor mat in. Makes it seems tio grainy (maybe its just the photo). I wouldn't have a problem with it if it were smooth, like our most recent BOM winners bike, but the texture breaks up the smoothness of the bike. At first I thought you had Line-X'd it like Proteal's tank.
Thats all I have. Its an interesting build, and I do like the frame color. Hope you put these opinions to good use on your next build.