The Pose:
The feminine pose has already been addressed, but needs to be repeated. Don't do it like that, man. All posing positions begin with the feet and is the foundation to build upon. Start with one foot in front of the other and have your weight on the rearward heel. This will put your waist at an angle and the leg bone is connected to the neck bone and whallah, you have a forward and rearward angle of your shoulders to the lens. Add to that a higher and a lower shoulder position (back to front) and guess what... more angles for free. You could keep your mask (face) square to the camera, but a slight tilt, nudge, lean to the lower (forward) shoulder and you have created..... Say it with me...... dynamic posing.
Crossed arms create a visual barrier between you and the viewers. Sometimes it is wanted, but this shot doesn't look like you're going for the bad-ass look. Place the hand of your forward shoulder midway of your thigh and the hand of the rearward shoulder on your hip. Damn, I believe you would create even more visually interesting lines.
The Lighting:
It looks like you need to tilt the flash head up about 15° or more. The forearms and watch face are getting the most light. Portraits are (typically) about seeing the face of the subject first and foremost. Since you part your hair on the left, at least it falls that way, consider having your Main light on camera right. This will help alleviate a lot of the shadow that is showing on your forehead. You need more cowbell on the halogen light, methinks.
All in all, not bad. Keep trying it and don't be shy about shooting yourself, especially in the foot.
Lastly...... Grey hair my ass!