On every Stackexchange site, we decide what gets advertised. Every site can have an advertisement decided by the community. Don't know if we have that advertising here, but we can make use of this advertising to promote Hinduism.SE on other sites.
See the above blog post for more info.
So, we can make one such advertisement for the promotion of our site, and post it on the community-ads post of other related sites.
I would like everyone to post an advertisement image, following the specs declared in the official blog post.
Also, please mention on which site it can be used.