When a user first posts an image using a model to that model’s page (using the "add post" button in the gallery. The one she's pointing at.), that model’s creator gets 50 buzz. This 50 buzz is awarded once per model per person, so if you separately post a unique picture each to two different models the same creator has made, that creator gets 100 buzz. The only cap on this is the creator can only benefit from 1000 instances of such post per month, but only the most prominent creators will ever get anything like that (I've been int he top 250 for a while and I've never gotten more than single digit instance of such post per month).
If this is your first image post for the day (rollover at midnight GMT), you actually get 25 blue buzz for posting. Since this 25 bonus will (for non-Flux models) actually be more than the cost of generating the image (assuming you used on-site generator and not crazy settings), the cost can effectively be negative. If you're creating from the generator, you can even just drag and drop the image from the generator panel on the side onto the web element asking for images.
I’ve recently learned this isn’t common knowledge, so I decided to make an article telling people about it. I’m not the first to make an article on the buzz awarded for making a post, but I was surprised that people simply didn’t realize this (over just not doing it "properly"). I personally care more about getting to see what people make with the models I created than the buzz itself, and appreciate people posting images to the models I make over tips for that reason.
Bonus: A creator, of image or model, also gets 2 buzz if you add their work to a collection. This has a separate daily cap from liking images (I rarely, if ever, see this cap hit but almost always get the daily upvote cap), and doesn't require it be posted within the last 30 days. This is, however, much less significant and is just a nice to know.