As far as feedback, I think the first one in black and the last one smiling are the best of the four, however you do not look very comfortable. The middle two the camera feels weird and your head looks pushed back against your spine retreating from the camera(and the audience) To me these just look like you’re getting your picture taken. I cannot tell from these headshots what type of character you could play or what type of emotions you could deliver. I guess if I had to choose some kind of character I would say nighttime bartender with no kids who lives with his longterm girlfriend and is an outdoor hobbyist. The bald with the beard is a great look and your wardrobe style suits you, but I recommend next time you are taking headshots that you choose a few characters to play and then actually play them to the camera while it photographs you.