Penny has a stable personality but has been well loved for her 20 plus years.
Generally I have read mature HH don't make great pets as they can be aggressive & unpredictable.
Pennys brother Hawkeye is a beloved pet but can go thru challenging hormones at times.
I see alot with light eyes. Pennies eyes are brown. Also the eye rings change color with the sun & some are just darker than others. The brazilian HH has a brown crown not white.
I have red a few have a red spot under the tail which Penny does not.
Just not alot of pet HH around so data/info is limited & like all birds personality is effected by more than just genetics.
Hawkeye male left Penny female right brother & sister from same clutch. They look alike.
Penny