These look quite good to me, Edsger. It's hard to find something to suggest for an improvement.
All I can come up with is that the gentleman is taller than the lady. I deduce that by the background lighting pattern where she is ideally positioned and he is a tiny bit high (meaning the background light could be raised). How's that for a minor nit?
Watch out for the strong shadow between the nose and the eye esp. when shooting people with glasses. And I agree with Steady the hands look rather big and I would either crop or use longer lens.
If they are mostly dressed up in black perhaps a little bit fill on the chest and a bigger light circle on the backdrop would not hurt?
Setup is good and stylish. Skin and skin tones look good.
EDIT: One more thing. In the first image the left hand looks a little bit crippled. On the second I am kind of missing the other hand. Perhaps you could get a better balance with a pose showing both hands? The guy could have wrapped the fingers around the arm on the table, the lady could have extended her fingers. Just for your consideration.
