I found the missing thing I was feeling off.
As you can see I solved my own problem in the conversion, now it has something that protects, and that hides a bit the conversion, which is also very nice.
The bit is a demolisher/devastator/spriggan top with the horn trimmed out in order for it to be flat.
That will make the head kind of hard to attach but this is a problem for my own version in the future (Grajo2 Rage of Khador?? with more focus but less Jack points, I suppose :D )
Time consuming conversion but I think it totally worth it!!!
What do you think?