Well... either a) Don't paint features across a seam, or b) Be prepared to spend a lot of time and effort... Seriously, I wish I knew. I'm only just venturing into the world of texturing myself, and the only way I've found to solve seaming problems so far is to use a seamless pattern brush over where the seams meet, then use the healing brush to merge them into the rest of the texture.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire