Its more than just looks, your BO's (and mine and others

are a specific breed and so have certain dependable traits. Throw another breed in there and it changes everything. I also love RIR's, it was my first flock/breed but they are a bit "more" in some ways, a bit "less" in others, like broodiness/raising chicks, RIR's usually will not where BO's will...
My answer to that was (so far) to take my favorite young RIR hen and my absolutely gorgous and smart, sweet BO roo, incubate the eggs and I got a hen and a roo. The roo/son is now more peaceful than a RIR roo and since he's so young, I'm hoping he's as smart as his daddy. I am keeping them in pens/coops side by side so the son (BP, Brewster/Patty, his dad, mom's names) can learn from Brewster. So far, PB the daughter (Patty/Brewster) is a broody girl, sits on eggs laid so she's turned out nicely also!
In the meantime, my broody BO hen, Big Mama is raising her first brood and I'm not sure but I think Patty (RIR) left an egg or two in that nest but all I've seen is five fluffy and healthy chicks, all BO's. I know BO's eat more, are big standards but they are awesome and I plan to take Brewster to the state fair next year, he'll be three then.
I'll have Wed/Thurs off and take pics of the BO/RIR BP and PB if you'd like but its raining hard these past three days, will still be raining on my days off but I really like the personalities and traits of these two favorite's offspring so far! In the meantime, look at pics under breeds, from the search option on this site
Here's what I found on Search; Welsummer:
https://www.backyardchickens.com/forum/viewtopic.php?id=231329
RIR roo, first pic on the right:
https://www.backyardchickens.com/forum/viewtopic.php?id=237888