I try to lower the opacity, but then if i hit back over the brush again, it doesnt work out. Sorry but I am not using Photoshop, instead I am using Affinity Photo, and to be frank it seems like I could translate anything you have to say about it to affinity. I am having serious issues doing this though. This is as far as I can get with the actual coloring...Ive never worked in a dark to light flow before, more light to dark...
Any tips?