Original Image Copyright (C): *SasukiMimochiWhat is this?
A redline is when one artist draws over another artist's work as a teaching tool to point out mistakes and give advice. These redlines were solicited by the original redline owner as a way of learning - and were given freely, no credit required. If you are interested in getting a redline, check out my weekly redline journal (usually posted on friday) to sign up! Rules are listed there.
I hope other artists are able to glean useful information out of this :3