Excellent work. (I also cannot help to notice a work by my favorite painter: Modigliani, great taste sir!)
For the discerning British officer, a custom gas mask cast from his own face.
Judging by the ensignia, this one was made for a colonel in an Irish regiment...
Correct! on one account
1. Rank of Colonel
The Insignia is of the Royal Irish Regiment (1992) as you can see from this Image:

The Royal Irish Regiment of World War One has the King's Crown (no Harp lady either) . It was disbanded in 1922
Other then that I love it

I give you the Royal Irish Rifles with harp lady
and King's crown!:

But you're right- I used a modern image to create a transparent decal to use over gold leaf - the one below - didn't even notice the change in crown - I'm Irish - I don't know about these things

The little badge is removable so I will make another one
I will throw my hat in the ring and propose an alternative: VICTORIA LIVES!!!! (I have the Queen's Crown on my Martini-Henry)