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Thank you guys very much for the valuable advice!
I'll definitely concentrate much more on the catch light, I haven't even known about the concept and it's very important and still very doable with one speedlight!
I don't really want to use more lights as of now, but I'd like to upgrade for circular light for crazy catch light and one more to illuminate my backdrop but then again, I'll need more space for that and then it's gonna be perfect. I am waiting to put electricity up there so I can light it up properly.
About the missed focus - might be on 3rd and 5th - that's because the models moved around and the A7ii doesn't have a continuous AF for eyes - thus the upgrade for EOS RP.
Image related, here I managed to capture the catch lights and it defo improved the image!