Creating Filters

In this exercise we had to create filters by overlaying different layers?  I wasn't there for that lesson so I wasn't really sure what to do but I hope what I did was alright :D.  For these three I had a layer with a gradient of black coming from each corner, set on overlay.  I then overlayed a layer filled with blue and set it to 16% opacity then a scarlet fill and set it to 22% opacity.  It worked pretty well with the two landscape shots but not so much with the closeup of the mask.