need help with muscle texture

[ebon sail]

I'm trying to color this muscle type thing and it just doesn't look right to me what should I do to fix it?

[karmic flax]

looks good to me, just lighten the area. art always dont look good when starting, finish it trust

[supple silo]

For reference, I’d suggest looking at the colossal Titan from AoT

[misty slate]

imma be fr with you, continue like this. AS long as it is anatomically correct, you can always fix the shading when done