Photoshop - How can I add shadow

[Joechen350]

Hello, I want to know how can I add the shadow on the first image, and the little reflect on the other one, many people have told me in photoshop its called "radiant gradient tool" but I don't get how to use it at all, I've been there, but its not having the effect like those image below

http://i.ebayimg.com/00/s/MTAwMFgxMDAw/z/naAAAOxydUJTMOT5/$_57.JPG
http://i.ebayimg.com/00/s/ODAwWDgwMA==/z/AckAAMXQVT9S~sm7/$_12.JPG

 

[The_Traveler]

It is not clear to me exactly what you want to do.
how about uploading your own image with pointers to where you want to add something?

 

[KmH]

First use the Marquee tool in Elliptical mode to make an appropriate ellipse.
Then on the Marquee tool options bar use Refine Edge to feather the edge of the selection.

Then use the Gradient tool. On the Gradient tool options bar first select the Neutral Density gradient, then use the Radial Gradient mode inside the elliptical and feathered Marquee selection.
You will need to start and stop the gradient well outside the ellipse to get the right 'look'.
The gradient will only show inside the elliptical selection you made with the Marquee tool.
Start the gradient 180° opposite the direction you want for the light and extend the gradient toward the light.
That makes the portion of the gradient closest to the light a bit brighter than where the gradient was started.

 

[Joechen350]

@ KmH
Thanks so much, I was able to go all the way up to the "Netrual Density Gradient" part, but I just can't find the "Radial Gradient Mode" Anywhere in photoshop, I've look everywhere, can you guide me on that part so I can continue with that steps and all the other steps to see what the solution brings me up.

 

[KmH]

Here ya go. I did the Internet search for you ......Tell A Story Visually: Photoshop- Gradient Tool

Get this great reference book and you'll have Photoshop answers at your finger tips instead of having to be online - Adobe Photoshop CC for Photographers: A professional image editor's guide to the creative use of Photoshop for the Macintosh and PC

With Photoshop open, you can also just press your keyboard F1 key and you will get taken directly to the Adobe Community Help web site.
Or, click on the Help tab on the Applications bar, then click on Photoshop Online Help to reach ACH.

 

[Joechen350]

Ah Found it.
But I'm not getting this part
"Start the gradient 180° opposite the direction you want for the light and extend the gradient toward the light.
That makes the portion of the gradient closest to the light a bit brighter than where the gradient was started."

How can I start the gradient at 180 degree, I can't seem to find where to put the degree anywhere, and how can I extend the gradient towards the light?