As you probably guessed this might cost, and it can vary from £0 to £30.
To compete with the images might sound strange, I mean how can anyone judge whether one's images are good or bad...? You have to consider if its sharp, the light in it, angles, composition. Yes, there is a lot of things that need to be "perfect" for a picture to win.
But one of the biggest "issues" are that the picture must appeal to those who are judging.
I think there is a lot luck involved when competing with pictures.
But, if you are lucky and win something at the bigger competitions, then you can get quite a lot of money or gadgets but also get that picture published in major magazines and also get a lot of attention in other media. Which of course can be fun especially if you want to progress from a hobby photographer to more serious. This could be the start of your career.
I have so far competed in a Swedish photo contest on Fotosidan.se and got a 5th place but also an honorable mention on another image in the same contest.
Another one is in one of the English magazines, Digital Camera, where I got the 3rd place.
But the biggest thing is that I am in the finals with two images on one of the English major photo contest, British Wildlife Photographer award. And that feels as funny as hell ;)))