It doesn't look blue to me (a blue chick must have the blue rooster for its father.)
I don't think there is any good way to tell at this age. Chicks typically need to be a few months old before they really show the gold or silver leakage that might be another clue about which rooster is the father.
Any blue chicks will have the Blue Copper Marans as their father.
Black chicks could come from either rooster.
Black chicks with silver (white) leakage in their feathers will probably be from the Lavender Orpington father, and females with silver (white) leakage will definitely be from the...