Fantasy Landscape

Constructive criticism gratefully received.

With thanks for the following stock images;

waterfall 1 www.sxc.hu/browse.phtml?f=view&id=809822
waterfall 2 www.sxc.hu/browse.phtml?f=view&id=892805
waterfall 3 dracoart-stock.deviantart.com/art/Triphammer-Falls-21-100...
cliff polinife-stock.deviantart.com/art/norge-26163423
hills cat-in-the-stock.deviantart.com/art/Forest-Mountain-Unres...
castle www.sxc.hu/photo/1062780
sky resurgere.deviantart.com/art/Package-Sky-Scape-5-19199082

My interpretation of the following tutorial psd.tutsplus.com/tutorials/photo-effects-tutorials/how-to...