So I had another request to post the partner illustration that I created for talking about blend modes. This one shows how the main three modes look according to what element is in front and how light or dark it is. (Blending modes operate off of a complex algorithm that takes into account the darkness or lightness of each layer and gives a more emphasis to what is going on in the lower layer...) All you really need to know is that it makes a difference, so try switching the layers around if you are not getting the right look you want. Hope that helps. Feel free to use but remember to attribute where applicable.