This is super late, but...

I didn't know how other creators did it, so I made it myself lol I saved the character images I made in Zeta, placed them in an image editing app, created the title logo with IbisPaint, adjusted the brightness, etc., and finished it (

I haven't played Zeta myself, but I've also been generating illustrations on PixAI recently for cover art. Some app platforms have strict regulations on illustrations... Either way, PixAI is basically free, you can adjust the art style yourself, and I use Gemini's help when I'm stuck on prompts. However, a point to note is that if the technical aspects are lacking, you can't complete the content solely with PixAI. In fact, I didn't know how to process it within PixAI, so I just use my phone to tweak the images bit by bit. Specifically, if you don't do anything, the illustrations end up looking flat. There's not enough shading, or highlights, or contrast, and it would be a waste if you have a great illustration but it remains flat, so let's make good use of it. Another point of caution is that with PixAI, some content might be from other users, not the developers, and in some cases, there are usage restrictions (like no commercial use). When using it, always check if there are any usage restrictions or read the content description.

The easiest way is to use ChatGPT. With just the character image and composition concept, it can understand and create images better than image generation AIs that use English prompts. You can also prepare a single image and add a title logo to it. The downside is that when ChatGPT creates images, the art style tends to be very similar, that strangely sparkly one. If you don't like that style, I recommend creating an English prompt with ChatGPT, then using that prompt to create character illustrations with an image generation AI like PixAI, and then attaching the created illustration to ChatGPT as a reference image for it to base its creation on. By the way, PixAI is quite good in terms of performance. However, since you can choose from a wide range of illustration styles, it requires a considerable number of attempts to create an illustration to your liking.

I also use pixAI to create images. I usually just check the rankings daily and if I see a style I like, I adjust from there. For adding text, I reference X users who share free prompts to build my own.

I download illustrations created with DaysAI, then edit them with Gemini and add text.