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 Fran├žaise, 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.