You've handled the light well, captured a great expression and you've cut him out from a background really well in post. It's a good photo. I have a couple of suggestions, one easy, one a little more complicated:
I'd clone out the dark mark on his thumb - I find it a little distracting because it is central.
As I mentioned above, you've cut him out well but because of the light on his face I'm not sure a flat black background looks natural. I wonder if it might work with a graduated filter in the background, with light coming from the top left corner ( or the other way to juxtapose the light). This is purely down to my personal preference, but I wouldn't have it so even myself.
No, I don't want to be the one.His expression really says that he is a tough guy. I don't shoot portraits, but portrait shooters may ask why you cropped some of his body because as far as I know cropped arms or bodies are not very preferable.
BTW, welcome
Mark on the thumb is an easy fix but the BG was so cluttered with construction stuff, nothing other than taking it out completely worked. I am not generally a huge fan of dead black BG's but in this case it did help to convey a sense of "whoa, Nelly, best not cross his path."
Thanks for the welcome: As to the crop, that would generally be true in a formal portrait setting but this is more in a casual informal setting and while I did have some more in the scene, it did nothing to add to the mood. I just used the arm to further emphasize the direction he was looking.
Make my day - give me another necklace.
I do not mind the very dark background but a little bit of detail in it if it was relevant could make a very good shot even better.
Either he strong armed someone for those beads or he performed a specific task to earn so many, so while I don't want to be the one; I think the right chosen words can make any encounter with this gent most reasonable. Nicely captured.
It's always a hard call to decide on BG, some BG or no BG. There were three large sheets of tin and a bunch of scaffolding behind him. Even going into extensive luminosity channels, I couldn't get an even enough tonal range to make it work. In the end, I just had to go with "stern" all the way. I was shooting from a Mardi Gras float and didn't much time to do anything but make an exposure calculation and fire two frames.
We frail to give them adequate thanks.