Posted by Dave Bull at 2:56 AM, June 12, 2012 [Permalink]
The next impression is perhaps not so obvious - it's a slight gradation on the green from the left corner ...
This one is much easier to see - let's add some clouds!
And although we're not finished with the image itself, it might be a good idea to do an impression on the opposite side of the sheet, to help keep the moisture in balance:
