I think based on some of the drawings I've done for others, I'm going to add another tier to my pricing. Currently, for those who don't know it, this is how I price commissions:

Traditional:
$38 - base, $15 - additional character, $20 - background

Digital:
$55 - base, $20 - additional character, $25 - background

The problem is, some characters that I draw traditionally take significantly longer to draw than others, and these are chiefly characters who are mostly dark or black. The reason is that, since I'm using graphite, I have to grind it into the page to make a dark color, whereas a light color takes very little graphite, and in some cases none because I can use the graphite still on my blending tools to add tone. Also, I do suffer from Carpal Tunnel Syndrome. I did get a treatment for it last year in November, but it's about worn out now and making dark or black characters with a pencil accelerates it.

So from now on, I'm adding a surcharge to account for this. Characters which are dark or black will have a $10 charge over the base charge whenever I draw traditionally, to cover the additional time and effort it takes to bring the tone of graphite to anything close to or equivalent to black.