These are really great!
Captain Marvel
The rim lighting here is perfect. The light coming from the left could probably be increased a bit and shifted right just slightly as you can see it hits her forehead and chin a bit differently. It’s pretty close though.
The red light coming from the right could be more saturated for sure though. That’s an interesting one because it seems to be coming from the energy that’s around her, so it would be easier to recreate with a couple really close but very soft area lights that hit his forehead, cheekbone, and neck.
Tron
The under lighting could be moved forward a bit so that it’s hitting the bottom of his brow like in the reference, but beyond that I think it’s spot on.
Firefly
Nailed it. It’s simple but effective.
Vin Diesel
The rim light could probably be moved farther left so that the highlight is balancing out the key light, but that’s a nitpick.
Overall, very good work and I’m so glad to hear you had fun and learned a lot!
