Image Shading Tutorial!
Here's how to create Photoshop drop shadow.
A) Go to the Photoshop File menu and select Open file from the open dialog box that you want to work on.
B) First of all to remove the background you need to draw the path around the image. If you need help to draw the path then see theClipping Path Tutorial.
C) Once you have finished the image outline, right click and click on "Make Selection" to select the path.


Go to Edit menu, click "Copy >> Pause" or just click Ctrl + Win + CMD + Mac + "J" and you will get a new layer inside the Selection.

D) Click on "Create a new layer" at the bottom of the layer palette and you will be given a new layer that you need to fill with a non-color (color code: - fff000). So fill it with white color and place it under "Layer 1".

E) Double click on "Layer 1" for the "Layer Style" dialogue box. Click the "Drop Shadow" in the left column and select the desired Opacity, Distance, Spread and Shed size Make sure the "Preview" box is checked so that you can get a live view of how you're going to see live shades.

F) Once you're happy, click "Ok" to apply that style to the layer. Notice, you can return to this level style anytime you want to edit the films by double-clicking on the same level.


The above tutorial helps you learn Photoshop Photo drop shadow creating.
Here are some other tutorials you can try..
Learn how to Clipping Path in Photoshop
Learn how to do Masking in Photoshop
Learn how to Retouch Image in Photoshop
Learn how to Edit/ Enhance Photo in Photoshop
Learn how to Create Vector Image from Raster