Hi
It is gonna be a while before you can gauge the true colour of tattoo until the surface and under skin heal. Most tribal (or large colour pieces) require extra fill as you will always get spots which are not visible to the naked eye until it starts to heal.
That said there are some wobbles but tell the artist to powerline them and fix it up – it is all easily correctable.
You will prob have a good 15 hours worth of work going into that piece before it is finished.
Take Care
Matthew