Beautiful photos! And such adorable birds, I never see those here.
My experience has been it depends on what the texture of the bowl is whether the birds will bath or not in it. I have a sloped shallow bowl and isn't deep even in the center, but it's glazed ceramic and the birds don't like that slippery finish. I put it out during the winter when I use a heating element to keep the water from freezing, because that glazed finish makes it simple for me to clean by just wiping it quick with a paper towel. Green algae still grows in freezing temps.
I have a larger and deeper all concrete bowl though that they go nuts over jumping in it and splashing around, I've seen as many as 10 smaller birds in it at once, the depth doesn't bother them at all. Sadly I woke up to it broken last summer, and while they drank from the plastic replacement I put up temporarily, rarely did I see a bird actually go into the water. I also got another concrete bowl only I set closer to the ground about 25' away and that became their new preferred bathing and splashing place.
Birds can be picky!
