while I voted 'all of the above' if I had to choose only one it'd be the copics....you've really developed your own style on that medium. And they look really cool with the minimal color thrown in.
thats my 2 cents lol/

Well thank you. I tend to think that the copics are better suited to sketches in which someone actually receives the original. In this case however, Im trying to figure out some good print options. Mainly because when my prices go up, its possible that I'll loose business

--
Check my journal for prices on commission sketches, I am always accepting!

I've not even bought a print yet... They're generally too expensive for me, and I don't really even display my own art..

But I would have to say ( I've test printed some things of mine ) The more detail.. the better the print. Either on the subject or the whole scene. So I'd have to say "more realistic". In that you spend the most time you would on a piece, to get the most details in.

You're the first and only person I've commissioned, and so I'm sure I'll be buying some prints of some of your more detailed pieces!

I just like your style, man.. Keep it up!

Thanks man.

I would totally recommend buying DA prints, the quality is very good. Yeah, they are pricey, but its not like a poster or something, they're frame worthy for sure

--
Check my journal for prices on commission sketches, I am always accepting!

well its a tough balance...you gotta eat just like the rest of us, and to be honest you've kept your prices at rock bottom for a long time - i think your price increase is pretty modest, and more than fair, especially regarding the quality of each sketch.
See your point though about the copics, a good medium suited for throwing out originals.
I think then your colored pieces like your Joker or the geisha series - ones in that style I'd love as prints. Doing limited/numbered print runs is always a good idea too - people enjoy those I think.
I don't really know 'art' just know what I'd pay money for.
Pretty much the quality of your work stands for itself, and if you keep as industrious and as busy as you've been I wouldn't be surprised if your schedule increases regardless of price rise.

dude, you can buy prints of all the geisha pieces right here on deviantart

--
Check my journal for prices on commission sketches, I am always accepting!

Cool. I'll look into it!

yeah sorry I know - I was kinda getting at that style of piece as an example of style if you plan on doing future prints. I think the detail, coloring etc reflects what works well in a print and thats what i was trying to get at as opposed to the subject matter or what you've got available right now.
lol sorry, like I said I'm not in the art know - just letting you know what catches my eye if I'm buying prints (and i got a ton lol)...but now that you reminded me I do need to pick those prints up off you one of these days lol

I voted for copic markers myself, because I think it's your strong point.
But haha, you're well advanced here : none of the possible answers is a marked win !