There are no clearcut rules of Bluebook tables and figures formatting. Still, you’d better stick to some popular format, such as Chicago, just to make sure that you have not missed anything.
Figure 1: A Supreme Court Interior.
Source: Courthouse: Courtroom, wbdg.org, https://www.wbdg.org/images/courtroom_014.jpg (last visited Apr. 12, 2024).