Wouldn't it be better if about three additional images in the character album were allowed, as long as they are closely related to the character? Stuff like a weapon they always carry, or the environment where they are most often found (like a nightclub for a bartender character). Alternatively, you could at least permit one image of accessories, if not entire environments. I might not have any characters with separate accessories like that, but they are common for combat-focused roleplay characters with weapons, or for feudal society characters, like flags and emblems, or even ID badges for characters in modern and futuristic times.
I know there's the point in the rules to use other image hosting platforms for such images, but it can be inconvenient and disjointed, since most people expect to have everything in one place. Besides, clicking on a separate link to a different site, which often requires age verification or a Captcha, is a degree of separation most people wouldn't bother to check, or miss, even if it is prominently displayed in the description. To moderate this, you could implement a requirement that any such images are appropriately labelled with an "accessory" tag. This could allow for automatic enforcement, such as a warning popup that only one image with that tag is allowed, as well as flagging albums that have multiple images with the tag.