It's funny that so many stamp engravers seem to have portraits as their expertise, although I must say that portraits are ideal for engravings, but what about architecture or even landscapes?! Those topics work very well on engraved stamps too. I suppose really everything looks better on a stamp when it is engraved!
I've been doing a little research on a well-known french engraver, Robert Cami, who, because he worked for the French postal authorities, also engraved a good number of stamps for the French territories. And it's great to see that he seemed to concentrate a lot on animals in the latter years of his life. Here is a rather beautiful example of that.
This is his 50f airmail stamp for the Terres Australes et Antarctique Française, or TAAF, which is so much easier to type. It was issued in 1956. There is also a 100f stamp which is blue all over (still bicoloured though), which looks even better maybe, but then, I quite like these two colours together.