Now, go to render settings.

Just duplicate these settings. The output resolutions should already be the same as the project settings, but make sure they are, or the picture will be distorted. You can name the picture whatever you want, and place it in whatever directory you want. If you check the start external viewer option, it will open whatever program you use to view images in. Just check on the render button in the main window.

And you should be left with an image similar to this:

Here is one done with Luke wielding a blue saber: