If you really want to "paint with light", then you need to have an external light source that will create the beautiful dimension that you see in paintings. Going for a 3D look in photography gives your images that "wow" factor and creates a more pleasing image.
Using the sun as your external light source is a great idea. After all, it is a light source! Knowing when and how to use the sun, though, is key. The sun is actually a very hard light source because it is so far away in the sky. It creates a small, directional line of light that can cause harsh shadows on your subject, especially is the sun is overhead.
Have you ever seen "racoon eyes" on your subject? That term comes from the harsh shadow that appears under your subjects eyes when the sun is overhead. The light stops and is blocked by the subject's head and creates that shadow.
Have you ever seen the "glow" on your subject's hair and head if the sun is behind your subject? That is the most beautiful light! But, if your subject is in front of the light, and that light behind your subject is the brightest, then what happens to your subject's face? Yep-it becomes very dark. So, if you are placing the sun behind your subject to create that beautiful glow, be sure you have another external light source in front of your subject to illuminate his or her face!
Clients would sometimes be disappointed if their outside portraits were not in the FULL sun, but on a more cloudy, overcast day. I used to say, "but this is the perfect lighting situation!" Why? Because those clouds act as a giant softbox of the sun's light! They diffuse the light to create a more pleasing, soft light. I then used my external light source to ADD light for shadows and contrast. Or, depending on the mood of the image, just used the sun and the clouds for a more flat lighting effect.
Whatever type of diffuser/light modifier you are using depends on what kind of light you want to see in your image. If you use a large modifier, then your light will be spread out all over and create a beautiful, soft lighting effect. If you use a small light source (like a flashlight), your light is all stuffed into a small area that has to come out a very small area! It will produce a very harsh source that creates hard lines and contrast between the shadows and light. It is very directional. Think of it like a pencil drawing that goes from one point to another. That line is fairly narrow and small.
The name describes the use fairly well. The "modifier" modifies the light so it is not so harsh. A softbox is just one kind of a modifier. Usually, a softbox has a diffuser, which "diffuses" or spreads out the light over a large area. Thus, the light will be "soft" not harsh. Other modifiers include umbrellas, barn doors, and reflectors.
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