For the fingers thing, It's what I was speaking about in my tutorial : creating details where the figure does not have any or few.
The only issue IMHO is that all details will be not too much visible without good light.
Since the athletes skin is quite dark, the shading and highlightning effects have to be not too strong to still realistic, but logicaly you need good light to enjoy them.
It's something you have to be aware of if you try to paint realistic dark tone ethnic origins skins.
