LOOKING FOR SUGGESTIONS

How about a patron-driven character? First everyone on the tier decides which of your characters should be "upgraded". Then every two weeks or so you make a poll on how they should grow and continue the sequence based on that. For example, Papaya is the first girl chosen and the second poll has 5 people vote on larger breasts while 2 vote giantess, so she gains a hefty bust increase but only a foot or two in height. Two weeks later 11 people vote for milk, 2 vote for breasts, and 1 votes for nipples. So the next drawing features a massive increase of milk and only a little breast and nipple growth, shown off perhaps by making her breasts appear extremely engorged as if she isn't leaking fast enough. This goes on for however long you'd like until a new character is chosen, and so on. Does that sound doable?

Antares

Animating is hard, so I think that is out of question but what about if you provide some stories (text) for your characters and maybe we could vote for scenes of it to become pictures.

Arragon

Sounds good but is this a tier reward?

mangrowing

One thing other artists do is have a series of pictures with a single model. Mainly so you can different viewpoints.

Calista

Hmm Yeah you are right and I've seen those pics on web sites not related to donations but I think adding cum or so is not worth as a reward for a higher tier it would make it look I just wanna make money in exchange of poor quality stuff, however I appreciate your suggestion :)

mangrowing

Making videos about me drawing my works is the only thing I've had in mind for a tier reward but wasn't sure about it was enough for a higher tier. However the streams would be another add to include, I dont know :P

mangrowing

I recall some artists having higher tiers with alternate versions of the same picture when they release it - such as added sweat, cum-covered versions, and other stuff. I'd like to give those a mention since I imagine they wouldn't be more time-consuming than the image itself to create.

I'm not a patron (yet) but a lot of artists do tutorials and guides sometimes at these tiers. Why anyone would want that specifically, I do not know. But maybe you could do a raffle for patron streams and have the winners give input on your next works. Honestly, I'd only care about pledge tiers if there are commission discounts or reservations, but I know that's not your thing at the moment.