Ok, first let me start by saying that this photo needs no critique. I already know that by the standards of this forum, this is seriously lacking image quality. BUT, you have to keep in mind that this was taken with Polaroid 690 film using the polaroid back. Anyone who's ever shot one will tell you that it's not known for razor sharp detailed filled images.
The intention of the polaroid backs was so the pros could get an idea of composition and exposure levels before firing away with the real film... and that's it. It's not intended for great overall image quality. That said, I think that given the fact that this is a polaroid scan, which came from an image that is physically 6cm x 4.5cm which is of course the size of the actual negative, you have to admit the 3 dimensional properties of this image are pretty cool. I've sent my first three rolls of 120 film out for processing and those will yeild much better results. But at least now I know that my polaroid back, camera, and lens are all working perfectly.
BTW: Since I know this is a Canon digital forum, I'll also offer this... My 5D arrives on Monday, and I'll be running it through the initial battery of "is it working correctly in every way" tests. I'll post pics as soon as I can.