This is what you call sketches?! o_O To me they look like finished artworks! I really, really love the colours. Colourful artworks are amazing and not very easy to do. You can mess up things easy, if you use a lot of colours.
Thanks! Yeah, they are really small and easy to do with texture brushes and some texture pictures. It's the first time I've tried this technique. I'm not very good with landscapes - so this is some chance to me to learn how to do them ^^