As far as I know there's no rule against it, though I couldn't speak for other forums! Our main no-nos are just the basics - family friendly (or else put a PG-13 warning on your post!), no trolling, no advertising, no talk about purposely breeding (we do/have had breeders on the forum, and people with accidental litters, but questions like "when is the best time to put my male and female together" are out).
I think it's just that most people either through preference or circumstance tend not to have pictures of their buns that also have people in them (I have probably 100 or more photos of my bun and like 5 with any humans in them), so you don't see that a lot. Plus the usual shyness of posting pictures of themselves to the internet.
I think your sig is adorable!
Thanks, Liv, it's lovely!
"Right, well, listen...gotta dash. There's a thing going. Well actually, four things. Well...four things, and a lizard."