I'm not familiar with your particular camera, but since it appears that you used a normal focal length, and because I don't see why you would have needed extreme tilts, I doubt if it's the bellows. And ditto on the above advice.
Hi I used a Sinaron SE 240mm my sharpest lens but I think also its not the bellows because the bellows would be vignetting on the bottom, normally!Yes Jim this is not a bad idea I will do so in the future!Thanks Armin
if your camera was aiming down and you were using quite a lot of front rise you might run into a bit of bellows starting to get in front of the projected image. I like the darkening on top, I think it helps with the blankness of the wall. To be honest otherwise I personally find the image rather insipid. Dennis
tones on this are great.. the slight off axis perspective is a bit bothersome (as in you weren't quite plane with the subject, which is projection because I do it a lot and hate it when I do it too lol).