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I suggest you use krita with this comfy ui plug in. Krita is a digital painting program like photoshop. Comfy ui is a graphic user interface for using different ai models. Normally you find different trained ai model checkpoints in civitai and use them in comfy ui.
When saying ai image generation, the beginner will go to use tools like mid-journey, chat gpt, grok etc and start asking the chatbot to generate images. But that gives you zero control other than prompting, which sucks.
With comfy ui, you can easily mix and match different ai model checkpoints, control net and adjusting a lot of parameters for precise controls. An alternative of comfy ui is stable diffusion web ui, which is also very popular but I think that one only allows for stable diffusion models (so you cannot use flux checkpoints there).
However, comfy ui is not really that artist friendly. The Krita plug-in I mentioned link comfy-ui to Krita, allowing you to use comfy ui in the Krita interface with some artist friendly control, so you can easily do full ai image generation, paint over, partial ai image generation. Basically the plug-in provides a very advanced generative-fill feature for Krita.
Comfy ui is running locally on your computer and it's free which brings a great advantage btw.