Here's something I've been playing with.
What do you do when you have a poor photograph taken in less than ideal conditions and you have to do the best you can with it? Sometimes the problem is the show pen size or colour, sometimes it's the lighting is low and sometimes it's a flash problem. If you can't change anything you have to try and work with what you can get.
This is pretty typical of what I see. This one was taken in a photo box. I've noticed that when birds get too close to the back of a box you can get a backshadow that detracts from the photograph. At the time this was taken there would have been at least two maybe three cameras shooting with flashes going off, plus there was lighting from above. It looks like we have multiple shadows.
So I've tried to remove the shadow in Photoshop. I have not done a good job but it's the first time I've used the quick selection tool. I now need to work out how to refine the edges and get a more professional look to the extraction. This is too stark. I've also messed with the colour but I don't think it was an improvement. Back to the drawing board. I don't think I could be bothered doing this sort of thing all the time but it could be useful if there was an important picture to fix.