Yes, that is one way to give a subject a glowing appearance or double exposure look, but you need heavy overcast or deep shade to achieve the long exposures, which in turn will give you a blue cast in the images. When using these techniques, try to stay away from mixing white areas and dark areas, such as light sky areas in between tree leaves and branches, and of course, where the light sky meets the horizon. You will get the white areas bleeding or overlapping into the dark areas. Sometimes this works depending on what kind of look you are trying to achieve. This works good with meadows and if you had a cluster of roses as in your example. It also works good on close-up subjects where the background is simple. See my example below. One thing is good about this technique, you don't have to worry about wasting film, you just keep trying to achieve your vision, if it can be done.
JMR
