your pics have definatly improved. good show m8. beautiful tanks, all of them. take a good full frontal shot of 1 or more and post them here and I'mm sure you'll get the required nominations to enter TOTM again.
I wouldn't paint it, I (an this is only an opinion) would get a backdrop that is a picture of corals and live rock. it will add depth to the tank as it will be a continuance of the foreground.
edit: my tank is not complete either but I entered it and won. as a former winner lets see that competitive spirit from you!!!
lol tanked i'll take a few more shots tonight and go for it
i like the background idea but they never sticks,it ends up having bubbles(air pockets)in them and they look bad.
still i'll look around for one it is a good idea.
I use scotch tape at the top and bottom of the tanks to hold it and mine look great. if they get air pockets just untape one corner, smoothe it all out and retape the one corner