coloring and simple shading & simple/pattern bg are free of charge !
revisions during sketching and minor changes during rendering is free. but major revisions (changes in pose, base colors, etc.) during rendering will add an additional fee....
i always send an update when i finish rough sketch, sketch cleanup/lining, base colors, rendering!!!!
when a commission is finished, you recieve an hd + transparent (if applicable) version of the piece