All Firefly aspect ratios meet the 4 megapixel requirement, and there is no requirement to upscale. Firefly is good with some prompts and bad with others, so it's really a case of trying out different prompts, styles, techniques etc. to find something you can work with. I don't think the campervan is a good one to work with because it has too many artifacts. For Stock images I like to use Firefly to generate the main subject of my image, then I bring it into Photoshop and make the canvas size quite a bit bigger and I use Generative Fill with a blank prompt to expand the background around my Firefly image. I do this in multiple 1024x1024 blocks because that is the maximum size that you can generate with Generative Fill - anything bigger is just 1024x1024 upscaled. When I've filled in my canvas I flatten the image and add a Levels Adjustment Layer and use that to crush the white level, which helps show up where joins between the 1024x1024 blocks are noticeable - usually in the sky or in gradients. Then I fix those joins up with the color mixer brush and remove the adjustment layer. Finally I downsize the image to something closer to the required 4 megapixels and save as a jpg.
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