Indeed when you are shooting landscape not much can be moved, you generally try to position yourself to take the most expressive viewpoint. When it comes to things like shooting macro flowers, it may be to your advantage to manipulate the environment.
I will give you an example...this past weekend I decided to take some flower shots in someones backyard on a sunny day. The shots overall came out atrocious, one after the other...I couldn't believe it! I was suppose to be getting better, not worst! Well, I asked someone to stand over a flower to produce a shadow & I held up a flower with my own hand to make it appear more erect. Finally, some decent shots.
The direct sunlight produced an overcast in some areas & shadows in others. I have shot some okay shots before in direct sunlight (case in point.....
http://www.pbase.com/image/25622931), but this time conditions wouldn't let me have it!
Another interesting point that someone had brought up here, taking 200 shots to get at least 10 decent ones. I found that to be the same case with me. Is this normal? Is it an indication of a bad photographer? or is it the nature of photography itself? All of us here pick our best photos to post, but what would be more interesting would be to see how many shots you took to get that one good one & to see the same shot, but a not so good version of it. Even more intriguing would be before and after photos of post processing.