definitely no mucus/snot. it's gross, to me. spray, spit, that kinda thing.
i dunno if personal tastes counts... as in 'who' or 'what' i don't like, but this might spark a neat discussion.
i'm also definitely not into non-anthropomorphic images. i don't want to be looking at something that looks like my dog when i'm 'in that mood.' i'll take robin hood, lola bunny, or some kinda human-like animal sneezing, but not an animal on all fours, like pokemon or a generic animal. it feels way too sick for me.
macro is okay, if not used to the extreme ridiculousness. i guess i'm sorta more into the tame kinda thing, like if a mouse went up against a cat or dog sorta sense, as opposed to a giant fox smashing cars and buildings, lol. then again i dunno if that counts as macro.