Hi, mauilady,
The photos feature doesn't have the ability to move photos around at this time, but I'll pass the idea along.
One way you might have some control over their order is to create an album. Then, either upload photos from your computer (or move photos from your existing ones here) into the album, in the OPPOSITE order you want them to show up. The photos show up as "first in, last out", so the first photo you uploaded will be the last one in the series of photos that you see when you view the album.