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Hi Debra, the 200mm will 1.5 times more of the scene in the image. Each time the number goes up the image captured is proportionately smaller. So, since 300 is 1 1/2 times larger than 200, the 200mm image is 1.5 times more of the scene.
If you are shooting landscape for painting, a 50 - 75mm is the most natural look. Roughly what you can cover of your subject with your hand at arm's length and your fingers spread out. Any more than that and things begin to look 'fisheyed' and smaller looks 'telephoto' and compressed in depth.
Try an experiment, put your camera on a tripod and zoom your lens out all the way. Take a shot and zoom in 10 points, shoot, another 10 points and so on until you reach the capacity of your lens. Open your image editing program (Photoshop, GIMP etc.) and open all the images so you can see them all on the screen at the same time (Ctrl + the minus sign usually reduces the size of the image in most programs). Study all of them for depth of field, focus and just simple which ones look 'normal'. After that zoom in to 100% view and study each for detail and sharpness. Most zoom lenses have a sweet spot where they work best. Find yours and try to use that setting most. Good luck.
ps - expect to spend more on your lens than the camera body.
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