Thanks so much for all the help!!!!! For question 5's photo, can we say it's photoshopped, cos there doesn't seem to be any shadows underneath some of the players? And a few of the players seems like 'floating' above the grass?
Nope, actually I don't think the photo was photoshopped too much.
Reason why u dun see the shadow is that the photograph was taken at a very low angle... possibly with the photographer lying flat on his stomach.
The true reason ( which can be done without photoshop ) is as Torak mention, vignetting, which is this strange dark circle surrounding the photograph at the edge of the photo, which is an effect to emphasize whatever that it is surrounding. Technically as Torak pointed out, its wrong to assume its from photoshop as some lens or lens with hoods can do the same.
To TS, I would advise you to join this club but take note of what they do and teach you. If they teach you fundamental stuff, like composition, visual arts, placement of objects, cropping etc, then stay in there and learn.
Fundamentals help everyone in photography, by my definition, is the "skill that allows you to take the same type of photographs, no matter what camera you use."
On the other hand, if they start saying biased or equipment stuffs, like "Canon is the best", "You can't shoot well cos you don't have a GOOD LENS / equipment", then either you ignore them and concentrate on FUNDAMENTALS, or you can leave the club and do something worthwhile of your time.
Note that there's no point arguing with any of them based on what we said here. The pictures you take compared with what they take, is the best proof of who's good and who's all talk only.