After experimenting with taking pictures of my gecko I found some of the best pictures have been taken with most/all of the lights off, andthe camera set to a low/soft flash.
Here are some I took with all the lights off except our red night viewing light, and using a low flash:


Here's what it looked like without the flash; just the red light was on:

Whenever I had tried to take pictures with all the lights on in my room, it was always too dark, and when I put the flash on it would washed all the color out aswell...

But Try with some the lights off and see what you get! Im still playing around with how to get the best pictures, but Im sure others here know more than I do when it comes to getting great geckoi pics.