Male ore female?

[Lija]

Combination of the following, but only the first one is dead give away:
-Huge, in comparison to a body, wide at the base head. Females have much smaller narrower, kinda pointy heads.
-the size, 15 cm is about 6” at one year old also indicator of it being a boy, you can be assured he is not done growing
- the yellow line on a back almost gone, it is also let to susspect it being a male.
- not visible in these pictures, but boys tend to have orange colouring of armpits, especially more dominant ones.

[LeSchu]

Many thanks for the help. I've just looked, the armpits are dark yellow-orange