Does anyone know how to make a transparent image usibg GDP?

Does anyone know how to make a transparent image with GIMP 2, so we can test the "golden ratio" test time face —- the ration is adjusted ideal of beauty. Basically, the question is, can someone tell me how make a transparent image to paste to another so you can compare the two directley

Load both images in the GIMP (which will appear on separate layers). Change the opacity of the layer (the right of the bar at the top of the field of the layer) of the image you want transparent. Move the tool movement (left, the icon with four arrows pointing in different directions) for better comparison.

YYCCC 2010-11-30 Calgary City Council – November 30, 2010