I have 3.1 but no extrude node, I have tried to extrude it aftewards like you suggest iy but with a poor result… 
resample curve_bevelmirror.zip (710.5 KB)
Here’s a file, try downloading Blender 3.1 with extrude node.
I have the 3.1 now with your file, thats’ very smart thank you 
But the contour is still not smooth
No? well, I’ll leave it to you to work on.
I have given you all the advice and support I can on this matter.
Yes you help me a lot thank you very much
I have improved my skills 
I will try with zbrush to smooth the contour… 
And why not with blenders sculpt features?
I’m new to Blender and I know zbrush better…