Salut Franck,
Thanks for those crisp and clear shots of the helmet emblem. The pic is too fuzzy to be sure of the emblem sported by this K-4, but it sure looks similar. Great to see altogether that emblems were still painted this late in the war... Not an uncommon practice, as we can see other emblems either for JG 53 as shown also by this machine:
http://www.flickr.com/photos/2809206...57625380126592
Bf 109 K-4 W.Nr. unknown "Gelbe 9", IV./JG 53, Germany, March 1945. Source: 644 Tank destroyer battalion website.
or the well known Neuruppin set of pictures showing JG 77 K-4's sporting their unit emblem...
Cheers
Marc