While not a traditional portrait lighting style, windows are great for creating silhouettes.
Create a profile silhouette of yourself in front of a window. Put it in a post with the category Week 9 – Window Light Portraits – Profile Silhouette.
If you are working with a cameraphone, this will take a bit of coordination. Set the exposure for out the window. Bring your result into Lightroom (mobile or classic).
At a minimum:
Straighten it with Geometry. Under Light, bring down the blacks.
Use Transform to straighten. In the basic panel, make the blacks darker.