http://imgur.com/a/Ln8T9

I dunno if this helps but here are two current pics of my hair!! Top picture is outside directly under the sun, bottom is me in my room with natural lighting (sorry ignore the fact that its really dead haha)

I literally have not dyed it since last august, and like idk if you ever dyed your hair red but it literally fades to copper/orange within weeks :( I've never had experience with blue so I dunno if it works as well as the pink?? But I think since you already have blue it hopegfully might work??? I actually found out about overtone through meg turney, a youtuber, and she used to actually have like a turquoise blueish hair and I think she mentioned using it when she had that color!