Thanks, there is a beginning for all
Here is a third one which is my best attempt i think, and my last one made with Gimp :

(x3) 8 bp, 1-bit alpha,256-slot palette
and
(x3) 32 bpp, 8-bit alpha, no palette.
I think the last one TAK3.ico is a bit to dark for my taste. So I think I will use gaekwad2
Question: What did you exactly to create this icons? which programms and what did you do one by one?