All off the photos of flies are taken with a light nuetral background, usually pale blue or beige or tan. You'll sometimes see then taken against stone or treesbark, but a light fly should be taken against a darker background then a dark fly, which should be taken against a light background. The nice thing about taking digital images is the ability to take pictures and view them immediately, and discard the ones that suck, and improve on the images that are decent. Good lighting is essential for shooting flies but use indirect lighting.