When I'm looking for something that I want, the colour can determain if I like the item or not. Most of the items on ASOS have a number of colours so why not under each item description (on the main viewing page) put 'view in other colours' and when they click that option it goes through the different colours. This way the buyer can look at all the other different colours without having to click on the picture and wait for that page to load to find out they dont like it and then have to click back and wait for the page to load again and load onto the right page they where on? just a suggestion as my computer can be slow sometimes!
I know that there's a note to say more colours but it actually takes you into the other screen that you then have to come back out of x