I would say based on feet and beak , thst diet needs some veggies added especially fids with beta carotene like , cooked sweet potato, peppers, carrots, romaine lettuces, swiss chard . Or getting them eating quality pellets .
The color of feathers I'm thinking is normal for some if the mutations. ..
There is a lovebird in the room but the lovebird always keeps to itself, I guess it’s biggest stress factor would be humans since they freak out despite all being hand fed
We got her when she was too young to wean (seller lied) so we had to finish weaning her.
Molting can be really hard on them . It's possible just needs some extra support during molt. I use to have rough looking birds during molts. Then I bumped protein a little and calories a lot. Now molts are seem less, and they look lush year around.
I'd bump calories, offer boiled or scrambled eggs twice a week or so. Offer a few nuts like walnut, pine nuts . Continuing to work in getting them to eat fresh veggies . And as possible take them outside in a secure cage in light shade . It's great for them mentally and I see the difference in feather luster as well.
Your baby isn't glossy and glowing , pictures appear a tad under weight, and those are dry scaly legs . Nothing is screaming unhealthy, but never hurts to get a vet check .