The top photo is obviously foreshortened, which distorts the frame angles in the photos. So there's no way to tell, from that photo, whether the frame is bent. The other photos would all show frame damage, were it severe, and would probably show some hint of it if even mild damage were present. I do see a faint bow in the second photo, as Andy mentioned, but I'm not sure what to make of it. A true profile photo would show the frame geometry much better.