22yo
Disclaimer: I do not own Twilight! Cullen-mania was started by Stephenie Meyer and I take no credit for it. This is just for fun.
Step 1: Start with a fresh, high-quality image of your choice. For this tutorial, I've chosen a promo shot of Shelley Hennig (Thank you, Shelley-Hennig.Com!)
Choose Polygonal Lasso for your tool, settings new selection/feather 0px/anti-aliased. Outline the areas of the skin (one patch at a time) and paste the selections into a new layer. When you are finished, merge the skin layers together. It should look something like this when highlighted:
Step 2: Create three new layers over top of the skin layer: one for the mouth, one for the eyes and one for the eyebrows. Clip these out and paste them into their respective layers. You don't want the skin coloring to touch these! I've color overlayed the new layers so you can see an example here:
Step 3: Go back to your skin layer. Go to Layer/Layer Style/Color Overlay. Select Blend Mode: Color and play with various shades of cream. After some experimenting, I chose Hex Code #FDE8CA for this image.
Step 4: While still on this layer, go to Image/Adjustments/Brightness/Contrast. Play with the slides until you achieve a nice glow. For this image I wound up with Brightness: 13 Contrast: 15.
Step 5: Now it's time to add some effects to the hair. For this it's better to select the Anchor Point Pen because you can get more precise lines. You need all the help you can get with the hair! Go back to your first layer, create your points and curve them around the hair as best you can. Then right click and select Make a Selection. Choose 0 for feathering, or it will look messy! Copy/Paste your selection into a new layer.
Step 6: Go back into Color Overlay and select Blend Mode: Saturation. Then play with the colors again until you find a choice that makes the hair richer in color. I wound up with Hex Code #603F0A for Shelley. Then go back to Brightness/Contrast to make the hair glow to match the face. To get this effect, I used Brightness: 11 Contrast: 34.
Step 7: Now it's time for the little details we all love so much. Select the eyes layer and use the Polygonal Lasso to select each iris. Paste irises into a layer over the eyes. Go to Color Overlay. Use different blend modes to select either a honey or a blood tint for the eyes. Which shall it be, a good vampire or a bad vampire?
Step 8: The next few steps I took with this image are optional, but they tied the picture together a lot better. For the final image below, I added a purplish tint to her lips and created a layer for her dress so I could alter the color a bit. (from all we've done in this tutorial, I assume you know how to do this part yourself!)
When you are done having fun with this part (or if you wanna skip it all together) simply merge everything except for the first layer (your background image with the original photo) and toggle the Brightness/Contrast once more. This is to get all the lighting to match and to blend the final image in with the picture.
And that's all she wrote! I hope this helped you get your muse working. If you like, please feel free to send any of your creations my way. I'd love to see them!