What medium do you usually favor and about what dimensions do you use for a standard book cover piece? Are they the actual book size or scaled down?
Also, do you have any clever signatures or symbols you like to hide in your work that you wouldn't mind sharing?
I work almost exclusively in digital media these days, usually Photoshop or Manga Studio. Before I made the switch, I was primarily a pencil and ink artist. Hence the "Inkthinker" name, which I've been using for... well as long as I can remember being active on the internet. It was my first email!
Interesting you should ask about clever logos, are you already familiar with my other work? I do have a signature symbol, variations of which I will often use in illustrations. It's an icon of a lightbulb over a pen-nib, and you can find it all over my stuff on DeviantArt. Here's a good example of the logo game..
I don't think I've ever used it in Stormlight, because it would seem... inappropriate, I guess? Shallan's pages represent in-world artifacts, the lightbulb-logo meta-game has no place hiding there. I have used it a couple times for Mistborn illustrations in the MAG, and I did sneak it into an ad in the first broadsheet, but only because it seemed thematically appropriate at the time (it was an ad for lightbulbs).
Of course, the problem with a "hide the logo in places" game is that I often forget when and where I've done it at all.
I won't lie, I'm not overly familiar with your work but what I've seen, I'm a fan of for sure.
Do you enjoy the digital medium or do you miss the old days?
I miss the secondary revenue stream that original art represents once your profile reaches a certain state. I still work with physical media from time to time, but I'm completely consumed by the variability of digital drawing. It's given me the freedom to do a lot of things I could never do before, but that option for secondary sales is greatly reduced.
If you like playing hunt-the-logo, I recommend my older work from 2007-2012, especially the game stuff. I was playing it all through my work with Fantasy Craft. Those guys give me lots of freedom to play around, and the meta-game seemed most suited to a game book. :)