Well, I can show you partridge rocks. At least that will help some...
Partridge rock, juvenille feathered, pullet, no mature feathers.
Partridge rock, juvenille feathered, cockeral, some mature feathering on back beginning. Hence blotchy. I've since produced males that were even darker, like yours.
Partridge Rock, Cockeral (under 10 mos.), mature feathers.
And finally four shots of one of my complete pg hens which ONE of which I hope shows the pencilling well.
The chicks are cute too...
Edited to add...
OH TERRIFIC!!! That shot includes Caladan's sister, Puddle's rear end and side in some photos, see the difference in the two different pencilling patterns????
The darker bird and heavy pencilling is complete, pg. The lighter bird with the stipled pencilling is an incomplete pg bird.