I might have already been said but perhaps some exhaust venting through say a carbon filter (unsure how you'd size that) also if you ever consider growing photos a separate section sealed light tight for going 12/12.Ok so far in response to my new grow room question I got…
make it bigger
Add high power LED’s
Ductless mini split ( don’t know what that means?)
We need some more creativity here
I'd take a good look at power needs and pull the appropriate circuit/circuits and carefully consider placement of junction boxes and outlets (GFCI) to reduce use of extension cords.
Consider a back of the match book sketch with light placement, perphaps shelves, dedicated areas for cuttings/seedlings on the same room as your grow
Don't know your ambient temps where your growing but you may need to factor in heating/cooling/ humidity control.
Perhaps some form of automatic watering if say you wanted to take a week vacation.
Just my 2 cents worth