Creating shadows - Photoshop

Sometimes you might want to add a shadow to an object...

Copy the bottle image, create a new canvas on Photoshop from Clipboard and paste the image.

Use the Quick Selection Tool to select the bottle. Copy it (CTRL+C) and paste it (CTRL+V) so you have another copy.

Select the new layer with just the bottle on and no background on the right hand side of the page.

Layer --> Layer Style --> Drop Shadow... (Click okay on the dialog box that pops up)

Layer --> Layer Style --> Create Layer (Click okay on the warning dialog box that pops up)

You now have the shadow in a separate layer so you can select the layer and CTRL+T to Transform it (move, rotate, resize etc.).

You can also skew it using Edit --> Transform --> Skew