It seems to me that you're interested in lighting effects Wili, and your pics are certainly effective, although shooting straight at the sun is not in my opinion a good idea, because it looks unrealistic. For example, the halo around the sun in one pic is an artifact of the camera rather than what is actually there. Mind you, if that is what you want to achieve then fine. I manipulate photos all the time, and you can see some examples of what I mean here:

http://dennishodgson.blogspot.com/2012/05/photographic-abstraction-3.html

Take another look at your photos and try increasing the contrast. You might be pleasantly surprised at the results.