I guess the next version of GIMP is out...and includes a lot of features that would be OH-SO-HELPFUL for VN development, like grouping layers and smoother lines.
I was going to draw some new sprites for my other characters, but I'll try to keep that on hold until the Mac version is released, especially since I'd really like to reduce the jitteryness of my lines even further.
In the meantime I've been working on coding stuff. I think one of my major problems as a newb is that the RenPy documentation is probably great if you're already somewhat of a programmer, but sort of a head scratcher if you're not. It will give all kinds of examples and present all the syntax you need to put something in your code, but it's like the intermediate "step for dummies" version is missing. It's like looking up a word in a dictionary and the definition refers to another unknown word. And when you look up the second unknown word, it refers back to the first word you looked up.
That's the feeling I get sometimes, when I'm struggling to code. :-/ I was thinking of doing live composites for the expressions, but I made the decision not to pursue this after I started wondering what you need to do if you put the sprite on the right or left of the screen instead of the center. Do all the expression layers automatically readjust or do you have to code for each position? BAH HUMBUG.