I do:
Girls
Boys
Anthro/Furry
Nsfw

I DON'T DO:
Shotacon (nsfw)
Lolicon (nsfw)
Mecha.

Works can take from 2 days to a week, sometimes a little bit more depending on how busy I am. I send the first sketch to the client and if you like it I keep working on it and update you through the whole process.

Changes on the sketch can be made, don't wait until the drawing is almost done (or done) to ask for changes or it will have an extra cost.