yes they look lovely. I don't know if you are as nerdy as me re: keeping records, but I like to weigh them before giving to the broody. I no longer monitor during the incubation, but it's a guide to what sort of size eggs any pullets that hatch from them might lay.
Also, I don't know if you've thought about this at all, but if the bantam eggs are significantly smaller, you may want to give them to Mary a day later than you give the Welsumers, to try to avoid a staggered hatch (big eggs take longer than small eggs; there's more material to generate). That advice is based just on what I've read in old handbooks on hatching; I've not had bantams myself and I try to set eggs of similar size because of said advice.