The tank and rock look very nice. The pictures may be dark because the camera flash is reflecting into the lens. With the tank light on, you may have better luck with the flash disabled. If you can't do that, move slightly to one side so that the reflection will miss the camera lens. What lighting do you currently have in the tank? It does seem a little dark, but as you say the pictures scanned dark. It looks like you are making a lot a progress. Good luck with it.