As I crawl towards the halfway mark on the first draft of Clanless, I've begun to spare a bit of thought for thinks like cover art - and marketing. It seems the prevailing wisdom is to make sure your name is associated with one genre and one genre only - in which case I'd want to publish Clanless, and any future works of science fiction, under a different name than Tristan Gregory. Which is itself a pen name.
No doubt keeping things simple for my readers is worth making them confusing for me.
I'm still not sure I'll follow the prevailing wisdom in this case, though. Most of my very favorite authors have published work in several genres, and I like to think that readers are pretty smart. Certainly they can clue to the face that certain books are unrelated to each other unless specified... right? I can always start including a "other books by" section in my front matter which breaks my titles down by fantasy and science fiction, I suppose...
Still, all the talk about "building brands" is fairly influential. I don't have a lot of marketing clout to leverage, and so any trick I can use to keep my efforts focused on my most likely readers is a good thing. Then again, I kinda hope that even readers who find me through my fantasy novels might want to try out my science fiction. Personally I've always seen it as one and the same, as summarized by The Third Law and it's corollary.
I suppose it's comforting to know that I can always change my mind and switch the name on the cover. Unless of course I get successful enough that people would notice that kind of thing. In which case... mission freaking accomplished.