Actually, that photo of B6313 upside-down is from March 1918, when Barker was still with 28 Squadron, so it would be in one of the earlier schemes with the white square as the Squadron ID. He then went (with B6313) to 66 Squadron. I don't believe anyone has any photos of the Camel during this time. Finally, he was assigned as CO of 139 Squadron in July 1918, initially with the 7 bands & heart as shown in WNW's kit instructions. The last scheme, being discussed, had the increased fuselage stripes and hearts reversed, with the bare cowling. There's only one image of the final scheme I'm aware of - in Wayne Ralph's illustrated edition of his life, I don't think there's even a photo of it in this scheme. I'm sure I have a book with that photo in it, but I'm not sure where.
Rich