Very beautiful playing. Great choice of camera angles for a multi-cam setup. Adding a separation light behind you would help create better definition between subject and background. Similar to how we bring out the melody in music, one can also bring out the subject using lighting.
To put separation light into perspective, I'll list commonly used lighting functions.Key Light - The main light on the subject. Usually the brightest light illuminating the subject. Fill Light - Often placed opposite of the key light, the fill light aims to fill in the shadows on the opposite side of the face. The fill light is not there to remove shadows, it is there to balance the shadows on the darker side of the face, with the key light on the brighter side of the face. Separation light - goes by many names such as, rim, hair, shoulder, or back light. Places an outline of light around the edge of the subject. The separation light is often placed behind or above the subject, the side of the subject not facing the camera. The separation light creates a distinction between where the edge of the subject is and where the background begins. It is important to remember that in photo and video a 3D subject is being rendered onto a 2D plane. From a human perspective our brains understand how 3D things are visually separated, however when working with 2D images, such images can use some help from lighting to recreate that 3D sensation. Background light - used to illuminate the background. Another tool used to create separation between subject and background. Having a contrasting light here can help with separation. A great way to learn about lighting is studying examples of portrait photography. Do a search for one light, two light and three light portrait tutorials. ***Your video had a low-key lighting vibe. You might be interested looking up chiaroscuro and how it has been used in painting and photo. I really liked how you changed camera angles in the exposition of the fugue. I've found that a great way to learn about and improve production is to just do projects and make notes on things that you want to do better, and with every subsequent production you implement those improvements. To control the light from spilling on to the floor you could use barn doors, grids or various other light modifiers. Light modifiers can be DIY. For example, white foam core, or a white bed sheet can be used as a reflector.