1. Sketchbook This is the main app which I use, for drawing and illustrating. It seems a bit complex at first but then afterwards all seems fine, at least for me.
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2. PicsArt. I use it for putting the fonts and maybe apply some filters or put some finishing touches.
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3. Canva I use it only for backgrounds and getting the correct grid size, or to get some pictures or illustrations. I do the rest in PicsArt and Sketchbook.
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4. Ibis Paint X I rarely use this app, but when I do, I use it for the same things that I do in Sketchbook. I'm still not used to it though.
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And for sources of images, please make sure that you're using them from stock sites like unsplash, pexels, shutterstock etc.
That's all. I know this was short. I'll be uploading other chapters when I'm free :)