Photoshop question how to change size?

When I cut a face off of one picture and put it on another, the original face I cut is HUGE. A lot bigger than it shoudl be, how do I fix that?Photoshop question how to change size?
Educated Guess:

Use the Marquee tool to click on it, and a box should appear where you should be able to re-size it.Photoshop question how to change size?
I think the resolution of the two pictures are different.



the best think to do is go to edit %26gt; transform %26gt; scale and hold SHIFT while scaling (else the image is going to be too flat or too thin if you resize it)