I'm going to try this on the weekend. Meanwhile - I have a really basic question. When you're adding layers as you work, (how often) do you then flatten the image as you go along?
For example, once you do this step:
First thing I did was copy the base image and set it to screen @ 100. I then copied my screened copy twice more. This is 3 screened copies of the base image:
Do you then flatten the image so you have a single layer again before you take the next step?