JimJim wrote:
I wonder if its natural for mature males to have virtually no hair on their head

Most likely at one point this one did. However, it is not unnatural for quite a few specimens to have a genetic propensity towards progressive
'androgenic alopecia' as they mature to adulthood, and while it can be rather disconcerting to notice, its a harmless developmental condition and enthusiasts shouldn't worry about it. There
are chemical treatments for this that needn't cause undue stress if it concerns you though..although the efficacy of many of these treatments is debatable.
One thing I did notice, however, is that that tank is waaay too small for one of that size, and generally they prefer larger, terrestrial environments. Also, waste accumulation in a tank that size could cause some major issues down the road.