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If you want to get a request delivered, you got to think like an artist, or if you know the regulars and semi-regulars preferences, you just adjust your requests to scratch their itch, or if you want a specific drawfag, try to adhere to their style, preferences and usual thing they like to draw. Some even have specific chuuba trait that they like to draw.
Often if you request something very unique, or at least very different from the usual requests, they are also more likely to draw them especially the more "talented" artists.