I found myself doing also a lot of trial and error with layer modes since several years, but all along the path I think I mentally marked some usages, mainly depending on art category, I know for instance that "multiply" seems to be a must have for digital painters while "hard light" might be essential for texture artists. There is one I frequently use these days, the "value" one, very handy to preserve global brightness when you switch colour ambiance.
But, again, these usages may eventually show up once you've been practising enough..
Oregonian wrote:
A really quick and easy way to see the results of layer modes is to move your mouse cursor over the layer modes button, but don't click it.
How could I miss this one ?
That's a cool tip, thanks !