Not allowed on Gallery images.
https://www.renderotica.com/community/forums.aspx?g=posts&t=61941#post61941
LINKS TO YOUR SITE FROM RENDEROTICA
Last Updated 3/2/15 Edited for formatting 3/9/15
Links in Blog & Forum Posts, Images & their descriptions, Comments: Renderotica strictly prohibits the use of any promotional URLs regardless of whether the URL directs to a personal or non-commercial website.
Since we cannot control when an artist decides to convert their personal website to a commercial enterprise it has become impossible for us to manage the previously open policy regarding image links.
For previously submitted images, blogs, forum posts, or comments (previous to 12/23/2014) we will not be enforcing this policy unless it comes to our attention that a URL displayed now links to a commercial website at which time we will request the content be edited or removed.
Links in your Personal Settings:
Promotional links to non-commercial websites are permissible in the links field within your Personal Settings (Signature, Homepage, Facebook, Twitter, Deviant Art). Promotional links to commercial websites are strictly prohibited in Personal Settings.
Why are personal / non-commercial links allowed in your Personal Settings and not elsewhere? Because if the link needs to be removed or edited it can be done so in ONE place whereas every single submitted image, blog, forum post, or comment containing the link would need to be removed or edited.
Informational Links:
Informational URLs are immune from this links policy. The management reserves the right to determine the distinction between informational and advertising URLs.
Penalty:
Violations of this policy will result in removing blogs, gallery and forum posts, web links and/or images containing off-site URLs. Repeated violation or refusal to comply will result in banning.