I love the physiques!
The finish of these are looking good with what tools you are using. To level-up you may want to try PhotoPea - it's an online free version of photoshop that allows you the use of layers and a range of effects. If you copy the tits on to new layers then they are much easier to manipulate without disturbing the background.
The only real giveaways that this body of work has are where the pattern of a background has gotten smudged.
Again, great work.