They are very good, the top 2 are probably best. I also noticed, they are in the .bmp format and 3MB in size. It would probably be enough to present them as .jpg files, the quality loss would not be big and people with slower internet connections would be happier.

Thanks for the suggestion Vlasta. I had decided to go with .bmp for quality, because most people prefer quality even if it means a little bit longer wait, but maybe having both formats would be a good idea...