I started this months ago and couldn't get very far. The interface for Affinity Designer was really throwing me off and it took a while learn what was what on it. I still have a long way to go finding features I know are there but harder to find than on the desktop version. I hadn't really done anything this complicated on Designer on the iPad before and I am surprised how detailed it looks. Once I had figured out a few things, it suddenly came together really quickly and was mostly done while waiting for some baking to come out of the oven. A butterfly image might be a good candidate for this sort of illustration one day.
This is all done in vectors, no pixels. I think this could be simplified into a flat logo like image as well.