how to make a shadow with photoshop?

I was wondering how could I make my face look like if it was half shadowed.. you know like if half of my face was in the light and the other in the Dark.. in any case here is an example:

http://images.amazon.com/images/P/B0000 ... ZZZZZZ.jpg

Look at the face of Arnold... that effect that It has .. something close to dat is what Im talking about.
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That wouldn't be too difficult.

Some of the things I might experiment with are:
Airbrush (Depends on the source picture as to how much you're going to need to paint)
Brightness and Contrast/Hue and Saturation
Layer Blending Modes
Channels

I really think all you need to do is get in there and experiment and see what you come up with.

Can you show us the picture of your thinking of using?

Yup, or you can just start off with new layer with a gradient on it, black to transparent. Alter the transparency of the layer, smush a pixel here, a smudge there

dM already got that whole terminator thing goin' on... Except, the lenses in his shades ain't shadey (and you need red eyes dM)

thanks guys for your answers.. I did get started doing this but since I know little about photoshop , I just couldnt find a way.. now I have a more clear way in how to do this.. After Im done I'll post the pic in here to let you know how was it..


Well DM any picture wit a front view of my face, I have take many.. and all got them deleted.. I'll take some more picture later to show you

once again thanks a lot

you might want to just grab a new layer gradien on it and set blend mode in layer options to overlay. then a little brush here and some smudge there and you got it .

not to hard as they say, some burn might help to

lol you guys are making it too hard, just open the image, then go to filter>render>lighting-effects
that will make a shadow.

Thanks guys for the replies and lik I said I was gonna disoplayed after I done it.. well if you look to my avatar picture you will see what I mean

<--------------------------------- there it is...

I will put it in bigger size later, it didnt came out as I wanted but it was close enough, I need to do some more work on it so it looks REALLY REAL, because I still think it looks like that the images were just put in there .. in any case let me know what you all think... once again thanks a lot everyone.

yep, no problem, glad to be of service