I'd keep the detail where it's at right now, you got a nice amount going on at the moment!
I think you could tweak the contrast a bit to make it really pop color wise
Try to mix some other colours in to make hue variations, you can do this by hand or by generating specific maps in zbrush to help you do it, there is a tutorial on youtube which I recommend watching especially for the texturing part.
Looks pretty nice to me, does it tile? The image on the right is hard to read as it's got Depth of field or chromatic aberration or post process on it. If it hasn't got any of those things, then it doesn't read like a brick wall and needs some work on the material definition.
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I think you could tweak the contrast a bit to make it really pop color wise
https://www.youtube.com/watch?v=rNgs2DcAsF4
thanks you for your advices but a special thanks for @Grindigo.
Your link is just amazing and useful !
@silvershrimp : Yes it's a tiled texture
If you have or someone else have a idea to improve again my work don't hesited.
Here a render on Marmoset Toolbag :
And there you have the texture (only diffuse map) :