First off, I really love the idea of having a "Scalesona". It's very original!
But, I think that the picture you've drawn is a bit... bland? Maybe if you looked at some references and went by those for coloration, it would be a bit more appealing to the eye. The following is an example of what I'm talking about.
lizardscopy.png [ 171.27 KiB | Viewed 1235 times ]
I found some references of different lizards/geckos, and then I drew a quick example of a character. You can see how the realistic colors and patterns make the characters believable. I think maybe this technique could help you find the perfect colors for your Scalesona :3
It's really easy, too. If you have Photoshop: after you've found the perfect reference, all you need to do is draw the outline of your character, and then using an airbrush, blotch in colors. Don't be afraid to add on lots of layers, patters and details!
I hope this was of any help