Yeah, that is nice work. IMHO, some colored beeswax will fill the gap behind the tang, in addition to giving s soft fill that will prevent break out of the wood behind the tang.
I'm curious about the radius in front of the screw on the tang? Is that just a distortion in the photo,or did you file a flat for mounting the tang screw?
IMHO, it isn't necessary to file a flat to mount the screw. Once the screw head is in the countersink, it will blend in well, even on a radiused tang. Just for future reference.
Again, all in all, nice work.
God bless