/ic/ - Artwork/Critique

>>5042429
>noo you lack the fundies to doo thatt
Now here is what I can see how it is used, and I have tried doing it with studies (I need to do more) the thing is that they take a long time and they don't end up as clean as pic related, one of the things I really really want to know is how some artist after doing a linework they fill the bosy with a base color so fast? I can do that wusing the magnet selection tool (and it doesn't even do it perfectly) and that takes some time, what im asking is for tips for optimizing how I color stuff
Im not asking where the midtones go, where the shadows go, where the highlights go, and of course im not asking for how the anatomy works