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Nope, no 3d modelling, just flat black and white shading with colour overlay. Thank you so much for the compliment!

Whoah! What software did you use to get that 3d-ish look tho?

I did this on an 8th gen iPad using gen 1 Apple Pencil and the program called Procreate. I think it is more the light and shadow that creates the illusion of 3d than anything, which is true for most art. It is just a lot more pronounced when you only work in greyscale.