If you have an compelling feature in the foreground of the photo, it leads the eye to the main subject. Don't overlook close-up photos, which make a bold statement. Use a tripod to minimize camera movement. Your photos will be sharper. Close-up photography should be attempted on a windless day or with very fast film.
Texture is important.
Stones and bark, for example, make a texture statement and add interest. Place a smooth petal on a rough surface such as bark, and you have contrast.