nice! i also am using nano banana 2 for our cover art. i find nano is best at realistic looking art that is less of an ai generated vibe. my tools for in game art is still hooked up to gpt image generation but looking at switching to nano banana for all automated art gen.
I like using Flow for Nano Banana generation. With an Ultra subscription, Nano Banana Pro uses 0 credits on Flow. As far as I can tell, you can effectively generate unlimited images. I have ChatGPT Pro, but I think it is lacking in image generation ability compared to Nano Banana.