A few recent portraits...

i'm really diggin the first one

Last one is money.

I love the last one, first one is a bit overexposed.

The pink one and the last one. Very nice

Deliberately, but yes it is

All of the B+W ones are too flat, the 2nd? has what appears as unintentional blur, and just not overly exciting. The 3rd is most interesting.

As for the color set..
1st. The slight horror lighting isn't flattering. Also the shadow to the left of the frame seems awkward.
2nd. White light bleed on the left of the frame, leads me to think its due to a misplaced gel.. Also, his tie collar is messed up. Unfortunately its our job as a photographer to notice these things while shooting. I'm terrible at this.
3rd. Id consider it to be fairly technically fine, though maybe a little fill light on the left of the frame (his shadow) wouldn't of hurt.  Its missing that certain 'pop' though.
4th. Probably the most interesting of the set. I think the back light could of been brought down at least half (maybe a whole) stop. Just enough to keep some blown out highlights, but not overbearing. When lighting a subject, its usually best not to have highlights that are brighter than the subject, as they tend to distract rather than add. Once again, the flash you had to your side, needs to be higher, you are getting the horror shadow on his nose. It might of also helped get that reflection off his belt and shadow off his face. Once again, tie.

Hope that helped, and inb4 ignorant hate on anything I said.