Using Photoshop to "test" Glazes

I was wondering what glaze I would use for my windows series. I used photoshop to test the look of a glaze I was considering, didn't go for perfect photo, just enough --like a sketch to see if I would like it and I do. Just found an item where I had used the intended glaze and cloned bits of that glaze from the pear box where I used it before and cloned it around the window on the piece drying. Not a wonderful photo, but just enough to see that it would work for me and I will try this glaze when item is bisqued. The hardest part of glazing is deciding what glazes to use. If I can think about it now, glazing will be easier.