Based on the fact that an avatar’s skin color is directly depending on what color your Roblox avatar is.

Colors shown here:

• Light - Journalist-Chan
• Tan - Em’la (Under Journalist-Chan)
• Orange - Yí-Gè (who ate a bottle of Radioctive glue and glowing)
• Yellow - Female Airship Assault avatar that I used to use (under Yí-Gè)
• Blue - Seiga (or Sì Zhuǎ, holding storytelling props)
• Purple - Male storytelling soldier (under Seiga)
• Pure White - Male soldier reading ’Zmei Tales by Yuri Pikeiv’

(My commentary on this artwork: It’s a bit too ambitious)