This is a very simple effect, yet a very strong concept to learn that can lead to other effects. The GSP burning effect I used for his wallpaper uses this same concept. Download .psd file here.
1. Opening the PSD.
In the provided .psd you will notice there are two layers, one named "chuck" which is the original Chuck image you see below, and another layer named "ice" which is a layer in which the ice effect will take place. The ice layer is basically a cut-out feathered image of half of Chucks body.
2. Adding a gradient linear burn on Chuck.
Double click on the Chuck layer and the layer style menu should come up and add the following on the image below. Click on "Gradient Overlay" then add a simple white to blue gradient and on the "Blend Mode" option drop the menu down and select Linear Burn. This should turn half of Chucks body a slight dark blue color as shown in the image below.
3. Adding the ice effect in 3 steps.
Now we finally start working on the "Ice layer" and this is very simple, you just need to double click the layer to let the Layer Style menu come up and add three different styles on it.
Choose color overlay - choose a teal or light blue color and choose "Color" on the Blend Mode. Check the "Bevel and Emboss" options and use the settings on the image below. Depth 225, Size 8, and soften 0. Check the texture box to add a texture to the image, this is basically like texture mapping, you can choose any pattern you want, I choose the default nature patterns that came with photoshop and use the settings below. You can play around with the settings to your needs.
4. Finished.
Now your image should look like the one below, see the texture I choose looks like it's now part of Chucks skin, kind of like texture mapping.
5. Touch up.
As with all my tutorials I do touch ups and play around with the image more, in the included .psd there are layers which I've added blue eyes and icicles for Chuck for a more dramatic effect. Again I adjusted curves and highlights, then sharpened the image. Enjoy!
