Another design decision that I have to make for the books is whether or not to use bleed for the interior artwork. For those who haven't spent hours trying to iron out details like these, bleed is when the artwork goes all the way to the edge of the page. (And, technically, beyond it, in case the printer or the cutter is off by a small amount.)
Bleed would allow for larger pictures in the book, but it would also mean that I'd need to do a lot more finagling to make sure that it looked right. Some of the picture would also disappear into the margins of the book, as well, making it harder to see the entire picture in paperbacks without potentially cracking the spine of the book. (As ebooks wouldn't have this problem, I might even do two slightly different versions to account for that.)
Also, I have determine whether it'd be better to place a picture at the end of most chapters (so that it doesn't interrupt the text flow) or in the middle of the most relevant chapter. The former is something that I could do right now, without having completed the editing process; the latter would have to wait until it's closer to crunch time.
Both of these affect the character bios with bullet-pointed info that I'm drawing up: full bleed offers more room for text and where the bios go will affect what information I might include. I'll try to get feedback before making any decisions--let me know if you have strong opinions about any of this!