Wearing a hat and bare shoulders... is that the bad habit you're referring to?
That's the only thing that stands out to me. It's the part of the images (#2,3) I don't 'get'. Lighting might be a little hot, too.
#1 I'm struggling to suggest that either more or less DOF would help. I like the idea of what's being in focus, but he's blurred to this dangerous degree where he's just odd looking, either too blurry or not blurry enough.
1- I’m thinking the composition might improve by zooming in. I don’t feel you need ALL of him in the picture. Maybe a little bit more of the cig in focus
2 and 3. His body is a little too white (hot lights?), and that mixed with his t-shirt tan, is a bit distracting. If the colour isn’t even, I’d not include it in this picture. I’m also not digging the hat, mainly because you can’t see it. It could be a lampshade on his head. Maybe zoom out a bit and tilt the hat to see more than just the inside of his cap.
Nice sharpness on the eyes and nice use of the smoke.