1st of a 4-5 session leg piece -bruising

I had my 1st session of 4-5 sittings. It took about 3 hours to do the line work on the piece which goes from my knee to my hip and takes up the entire outside of my thigh. I have light bruising in some spots--not deep blue and purple more of a light brownish. Is this normal? I have 7 others but this is my 1st multi session and my first leg piece. So I'm just curious.

I know i got some light bruising during the course of my halfsleeve. some areas of the body bruise a bit easier than others.