Ok, firstly, thank you for all your help thus far, and it seems that it won't be a simple yes no answer..... i will attempt a bit of clarity here and hope that helps a bit more, there are no competition rules regarding copyrighting so in realistic terms I am free to enter the pieces either for sale or not for sale,
The images were taken from Google images and I have no way of contacting the person who took the original.. I've tried...Mosaic, think you're right, if all else fails I will footnote the original and leave it at that...
So, imagine a black and white photo of a homeless person on the streets, I take away everything, background, other people, walls etc leaving the basic 'shape' of the crouched beggar which i then distort with colour so it ends up quite 'pop art' there is very little left of the original but am still wracked by guilt that the photo doesn't belong to me...
I really hope that makes some sense, here is the web address of one site that I have some works on, it might help...
http://neeney.deviantart.com/
Again, any help more than welcome, competition not until Nov but need to make decisions soon, Thanks again, Eeeny