This is trivial but images in sigs are usually an ugly mess. I hate browsing other forums and enduring these Microsoft Paint jobs of people's favourite artists and whatnot. Like, for example, the only person that thinks having a pic of Nicki Minaj with her name written in pink 16pt Arial font is a cool aesthetic the person wearing it (and other hyer-deluded barbz). Allowing people to have signatures with 40 different artists in bolded pink font is more than generous tbh (see MLD's sig). Maybe if you were all adequate graphic designers it could work, but I've seen y'all banners and stuff and they fugly af.
To cosign what everyone else in here has been saying, please no images in signatures. Even if you limit the size, it still makes everything look cluttered and distracts from the posts.
The other pop culture forums that allow them make the threads an absolute pain to scroll through.