Things to note about your image:
The lighting is coming from above and ever so slightly in front of the subject, I'd bet if you drew a line from his mouth directly up, you'd hit the light.
Appears to be a single light source. Shadows don't look filled in enough to me to indicate that a fill flash or reflector was used
Shadows are defined but still have ...
The subject if obviously lit from above so that the light is at a low angle on the abs and creates dramatic or at least favourable shadows.
Hang you lighting from the ceiling (or put it on high stands) and put your self almost directly under it.
One problem you will have is that if the lights are not high enough they will be much closer to your shoulders ...
In Expert mode:
1) Choose the Elliptical Marquee Tool and draw either an oval or a circle over the image.
Adjust the shape by using Select > Transform Selection and using the handles on the transform box to alter the size, adjust the shape or move it around. When you're done tweaking, click the green check mark to accept the selection.
2) Go to the Select ...