Thanks for sharing - these are fun and interesting.
On the technical side, I like to suggest that portraitists pay particular attention to the eyes, including any reflections ("catchlights") in them. Notice how you, as a viewer, tend to have your attention drawn to your subject's eyes - the catchlight tends to reinforce the impression of life behind the eyes.
The presence of a natural catchlight often accompanies a more generous and revealing light setup as well - if the light illuminates into the eyes, it also tends to bring out the features of the face too.
You might try combining a catchlight with a pensive expression - or even an angry or fearful one.
Your hair is an important part of your look. If I was photographing you, I'd be tempted to try to find a background with a geometry that mirrors the geometry of the style you have chosen for it - something with a dark triangle oriented in a similar way. That might be fun!