[STUDIO] How Do You Keep a Faded Image Behind a Dot to Dot Puzzle?

It will not do it automatically. 

All you need to do is place your image, while still selected (or click once to select it), press CTRL & C to copy, then paste it by clicking CTLR & V. You now have one picture on top of another. You need to do this, because once the dod to dot part is done, the image it uses, disappears.

Now click the dot to dot tool, it is in the middle of the top toolbar and looks like an N with dots on the ends,

Pick the color (well black or light gray) for the dots and also pick the font color. If you don't want the numbers to appear, click the icon under font clor and at the bottom you will see a slider bar under the color bar, and slide it over to 0.

Pick your dot and font size, and your choice of font.

Now add all the dots that you want around your image, press submit when done.

The one image disappears as it always does and the other is still there. You then reduce opacity, which can be done by picking the image that is there, then pick Opactiy on the top tool bar and lower it to a number you are happy with. 

You could also click the crop tool on the image and leave only a portion of the image.

As well; you could lower opacity and crop of course too!