Originally Posted by
Tartan
When block placement is important, I put them up on my design wall and take a picture on my iPad. For some reason I can see which needs to be moved better in a picture.
I find looking at a picture helps too. Especially if you move the blocks around and then decide that you preferred the first arrangement!
Changing the saturation of your picture to black and white also helps to see the differences in values that aren't always obvious in colour.