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You can use any type of modifier that softens the light. An umbrella or beauty dish will also work well. Final point I'd make is, get a professional MUA - not the model, not her friend, not someone who does party/wedding makeup, a professional MUA used to providing makeup to camera.
Clamshell lighting is a technique commonly used by fashion and beauty photographers to create flattering, glowing light. In fact, if you look at a majority of beauty campaigns for the biggest brands, you will likely see this technique employed. It’s best used for flattering portraits for women and beauty photography.But it’s not just about distance. You can move your key light higher to create longer shadows or lower to create shorter shadows. You can do the same with the fill light.
Figure 1. Lighting digital diagram demonstrating the light setup in Figure 2 (created using Set.a.light 3D). While you will find some budget swing away heat presses ( Geo Knight offer the Jet Press hobby/craft presses, and Hix have the SwingMan Hobby Lite) generally speaking, clamshell presses are less expensive than swing away. The light helps to sculpt the face. But it’s still soft enough to avoid exaggerating skin imperfections. If the light doesn’t seem to be bringing out the cheekbones, try making the key light taller. ConclusionNote that clamshell lighting doesn’t create much in the way of shadows, which means that it’s not an especially strong lighting pattern if you’re aiming to create drama. It’s a flattering type of light, but not a moody one.