This tutorial is about make fog effect which added at animation image. I suggest that you are middle level, so some step no showed in here.Try it carefully.
1. Opening forest image. Go to Image/Image size, reduce photo size to 1000px width and 669px height. (Photo 1 The Forest Image)
2. Fog on the distance and dispersion on the foreground, we will make a few layers of fog, but with different gradations of saturation. Create a new layer (press Shift+Ctrl+N) and fill it with white color by using Paint Bucket Tool, then set up opacity to 95% for current layer. After that we need to create mask for current layer.
3. Select “Eraser Tool” on Tool Box with Soft Brush, Size: 100px, Opacity: 20% and make a few strokes with brush on Layer Mask area and paint over the nearest tree and stone, the middle and foreground. (Photo 3 Few Strokes With Brush)
4. To make the effect of realistic fog , press D to set up foreground and background colors black and white, then create a new layer and apply Filter/Render/Clouds: (Photo 4 Clouds or Fog Effect)
5. Change layer mode to Screen and set up opacity to 40%.
6. Add goddess picture from file to our main canvas. Then use Edit/Free Transform to reduce picture of Goddess a little bit and move it left like on my screenshot. (Photo 6 Free Transform)
7. Duplicate goddess current layer and hide the bottom copy (click on the eye, which indicates layer visibility). Go to upper copy and change blending mode to Screen for this layer.
8. Create mask for current layer with menu : Select /Load Selection to select layer content, then use Layer/Layer Mask/Reveal All to create mask for all the layer. Now remove selection with Ctrl+D and select the Brush Tool (Opacity: 45%) with soft round brush and paint background area with black color. (Photo 8 Add Mask Layer and Brush Tool Opacity)
9. Go back to the hidden copy of layer and make it visible again. Use Select/Load Selection to select layer content, then use Layer/Layer Mask/Reveal All again to create mask for all layer. Now remove selection with Ctrl+D and select the Brush Tool (Opacity: 61%) with soft round brush and paint background area with black color again.
10. Set opacity to 34% up for current layer and it last step. To get different techniques and effects, try yourself not only in twice but more. (Photo 10 Result Image)
Adapted from : www.photoshopstar.com