There’s a two settings that might help your lighting render a little better!
Contact Shadows will help you combat light leaks.
Increasing the samples as high as your computer can take at a reasonable speed is always optimal. This will also help with the noise issues.
If your computers samples can’t handle high samples, try looking into the D-Noise addon.
The lighting may also benefit from some rim/back lighting stemming from the bright spheres to give your subjects more definition in the dark environment they’re in.