Hey! First off, hi long time no talk.
Secondly, composition wise, this piece works well as a singular entity. Though perhaps moving focus to a third rather then central would be more beneficial.
Your overall colours are good, though I would recommend staying away from darker vs lighter tones and soft brushes. Perhaps aim to work with purples vs orange lighting and shadow, with a harder brush to blend. I'd bring more depth to the overall face by shifting the shadow to the back of the head and use orange tones to bring out the focus- presumably the eyes and 'mask'.
I hope this helps!