How can I increase muscles?

[Crystal Felton]

My thought is to use your d&b method to accentuate her abs a bit, so I guess first..is that the correct method?  And second...how can I better 'see' where the shadow and highlight areas are?  I think I've seen tutorials where they've changed to a black & white layer or something?

[Damien Symonds]

Try this ... a Channel Mixer layer with "Monochrome" checked, with these values: 0/+50/0.

Then change the blend mode to Soft Light.

Then mask to the stomach.

[Crystal Felton]

nice!