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For me personally, I'll take anything as long as it's within the art style I like, male or female. But I do know most of the users here are males so I refrain from posting male images, even though I see some amazing ones that I think even our male audience would like. (don't ask me to post them, I collect just too many images now and looking for it would be a hassle ^^)

I do believe the sketches will do fine too, since i've seen some sketches here and no one have yet to complain about them. But for index pages, I would say don't post them since they have no illustration value once so ever, and I would also say no for the airplane also unless it has a character smacked on it.