Comparison between M_V, R_e, and μ_V,e scaling relations of the ERO Perseus dwarf sample (violet), including UDGs (orange) from this work, and bright galaxies (black) from Cuillandre et al. (2025b). The basis for this plot is Figure 37 in Kormendy et al. (2009) with updates from Kormendy & Bender (2012), Bender et al. (2015), Kluge et al. (2020), Marleau et al. (2021), and Zöller et al. (2024), including brightest cluster galaxies (BCGs), ellipticals, and classical bulges (dark grey), as well as dwarf galaxies including UDGs (light grey). For the sake of clarity, we do not show the errorbars. The uncertainties vary significantly between the different galaxies.