I think it looks great. And it's a great excercise for an artist... you learn a lot about proportion this way. I know, I've done it, and you're right it is a pain in the ass. But well worth it. Plus the fact that the original ad is in there could be a comentary about the incompleteness of our world as portrayed by advertising. Maybe you could do a series of works that show what's going on outside the ads.
Wow. I can't believe I just typed that. I spent WAAAAAAAAAAAAY too long in art school. How my profs would be proud
