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I am not sure, my art is suitable for promotional purposes, cause my art is pretty subjective. Didn´t really get what you mean, like what kind of promotion material did you mean? :)

No matter what kind of art you use to create promotional material. The main thing is that it attracts attention. I've created some wallpapers here.
https://alphacoders.com/users/profile/192651
This also does not correspond to a classic idea of promo :-).

Okay, now I got it! :) Nice ones u created, thanks for explanation! :)