He's only 5 months old and has plenty of time to grow in size. I have a little ambilobe as well and is showing purple sometimes due to the red and blue colors mixing.
There is a shot of the female Sambava in this thread titled "Meet my panthers". Her sire is Rantabe from Chameleons Northwest. Both of these Sambavas are unrelated and I'm hoping for some screaming offspring from both these guys.