Hi anon!

Like in most things, my answer to tedious tasks is optimization with photoshop actions. I do not have standard actions for this since I like to make slightly different swatches per set, but basically what I do is record the steps after I copy my texture to the clipboard. Usually the steps are:

Paste texture in swatch.bmp → Resize → Adjust position of image → Sharpen → Fade Sharpen 40% → Flatten → Save

(For eyes, you will also need to rotate the image after pasting, and to hide some of the messy sclera texture I add a black fuzzy outline, I know there's a specific name for this effect but I can't remember it lol.)

I then import the file with the new swatch in BodyShop and move on to the next texture.

(If I'm feeling extra lazy I will also have additional starting steps to copy the texture, switch to the swatch.bmp image, do everything listed above, and then switch back to the psd where I have all my textures saved as layers so that literally all I have to do is click the next texture layer. But this requires you to open your images in a particular order since the actual action steps recorded will be "select next document" and "select previous document," so it matters what photoshop recognizes as your first and second documents, if that makes sense.)

I whipped up some quick sample actions so you can get an idea of how they work, but I would encourage making your own versions so that you can make sure they're the right size and centered how you want. I didn't make one for blush because it's hard to estimate what part of that you would want to show.

Sample Swatch Actions: SFS / Mega