I see that you've moved ahead and started attempting to garden these tags into existence and wrote very rudimentary wikis for them. Bulging veins, veiny nipples, veiny clitoris, clitoris expansion, and projectile lactation.
Bulging veins is a questionably useful umbrella tag, especially the way you're applying it. Although you wrote the wiki as "on the body", it's telling that you've only been applying it to penis veins. And that you didn't apply it to your other vein tags.
Clitoris Expansion seems to be nothing more than erect clitoris, though you've only added to one deleted post so far.
As a side note, be careful with tags like nipple penetration and breast expansion. You're adding them to images where they don't apply.
The rest of them seem like they have theoretical viability if they catch on - notably the lactation one - but I have my overall doubts about most of them.