Here is more on how a professional photo shoot can help do this while still staying true to what modeling digitals are for.
The Lighting
Most people do not understand all light is not created equal. If we are talking about sun light, there are various factors that alter how it looks on our skin. Direct sunlight is probably not ideal for modeling digitals. It is a harsh light. So, using a shaded area is a good idea but it can vary on quality too, depending on what is around you. For example, if you are in the shade but a yellow wall is nearby, it might unknowingly be casing a slight yellow tint on your skin. Or if you are on grass, you might have a green tint to you.
So, if you are trying to avoid using direct sunlight and you try to take the shots indoors, the quality of those lights is also not good. Most indoor lights are not the same color as daylight. You might borrow a ring light or similar from a friend, but it is also not going to be ideal. Will it be enough to evenly light you for the full body shot, for example? What about the background and lighting it?
With a professional photographer in a studio setting, they are likely to have high quality lighting with plenty of light modifiers to make your skin look very soft for your headshot or to draw out those abs for the full body shot. They can also light the background in a way that complements your skin tone.
The Background
As mentioned, it is ideal to use a background that does not blend with your skin. So, again, you might want to stay away from an all-white or off-white background if you are very pale. Equally, you might want to stay away from dark backgrounds if you are dark-skinned.
Usually, you will want to find a solid wall and clean floor. Alternatively, you could also work with a photographer that might have or can create a seamless background. This is personal preference. A seamless background is one where it is a solid color, wall and floor, as if there is no defined wall or floor.
A professional photographer working in a professional studio will be able to modify the color and brightness of the background as needed depending on your skin tone and outfit colors.
The Camera
Smartphone vendors keep claiming how great their cameras get with each new version. Certainly, having a camera in a smartphone is convenient and they take decent pictures. But there are issues. For example, the newest iPhone does not even have what most photographers would consider to be a portrait focal length. This means images that are slightly warped in how you look.
Working with a professional photographer they can use focal lengths that are more ideal for portraits. Thus, the photos end up being a more accurate representation of you. Further, they will be far better quality. After all, a smartphone is no match for a commercial-grade camera and lenses.
There are some assumptions being made here. First is that the professional photographer is working with a full-frame sensor DSLR or mirrorless camera. Second is that they have quality lenses capable of varied portrait focal lengths.
Some people might argue they can hardly tell the difference between a DSLR and mirrorless camera compared with their smartphone. This does not consider that others can, especially others that regularly work with imagery like modeling agencies and creative directors.
A Ford is a car like a Ferrari, and both will get you to point B. But if price is not an issue – and it is possible to have affordable modeling digitals – most professionals will opt to use the Ferrari to get to point B. You arrive in style and exude a certain character. A model is in a similar scenario when choosing between having their digitals done by smartphone or by a professional.