The first images looks very familiar, inmediately recognized it from a few years ago:
http://stotty.deviantart.com/art/Dream-Lights-Collab-Part-1-948907I know the .tgw is posted in public, so honestly it's not really your own work. Maybe you should credit Stotty for the tutorial/files.
Nevertheless I like the postwork performed on it. The clouds look very nice, though I'd blend them a little bit smoother into the TG atmo and also make it more grey/darker so it corresponds with the lighting on the terrain. The foreground texture is a nice touch.
The second image looks quite nice. Good use of phototexture and water transparency. A few things I'd change is the colour of the sand (too yellow and bright) and I'd reduce the gamma, decrease mps a little and increase shadow lightness to >64% to get rid of the washed out shadows.
Keep up the work and posting.
Martin