Is there a tag, or should there be?

The following three images are tagged "twintails".

post #2747594
post #2747765
post #3025846

So are these three:

post #2200531
post #554405
post #1200401

Should the first three have the "messy_hair" tag, and the last three "straight_hair"? I've been trying to differentiate between the two styles, but it seems these two tags are under-used.

Or perhaps the fluffy twintails should have an entirely different tag?

I'd personally use big hair for the first set.