If you don't like the view point you have chosen, you can redo the above steps till you get a better view. If this is the case, close the perspective window and return to step 2. If you like the location of the view point, but are not happy with the way the perspective was rendered you can, right click on the image to change the settings of the view. The vertical angles control the upper and lower extent of what you will see. Zero is horizontal.
Positive numbers are for up, and negative numbers are for down.
The view width is also a factor of the distance of the view. Use a low number like 40 for long views and 60 for short views. In the observer above ground box you can change the elevation from which the view is built. If you change the elevation, your view angles will have to compensate. You can use a high elevation to get aerial perspectives.