Dave Hill and Parc Cruz Effectdisclaimer: Use this at your own satisfaction. If you find this tutorial useful, feel free to distribute it to our fellow photographers, you can also donate on my paypal account accemm2000@yahoo.com 
open your desired portrait image
duplicated the background image
set the blending mode to screen
add a layer mask, hide all
make sure you select the layer mask
brush the eyes off to make it more brighter
change the opacity to around 50%-70% depending on your taste (do not make your model look like an alien)
merge the layers
add a channel mixer adjustment layer to convert the image into b&w
monochrome, red 54, green 54, blue 32
change the blending mode of the channel mixer to multiply
select the merged layer (background)
apply an image adjustment shadow/higlights to make the photo lighter
shadows: amount 50, tonal width 50, radius 144
highlights: amount 50, tonal width 50, radius 30
adjustments: color correction 20, midtone contrast 0, black clip 0.01, white clip 0.01
merge the layers
select the dodge tool, highlight, opacity around 40%
dodge the eyes part to make it more appealing (again, do not make your model look like an alien)
duplicate the layer
apply a high pass filter of around 80px
change the blending mode to softlight to add contrast to the image
merge the layer
save your image
you can still fine tune your image by using your other techniques
here's the image before and after
