A crossover series by "Ghrolath4" (https://www.deviantart.com/ghrolath4) & "LinART" (https://www.deviantart.com/linart). It is a sequel to "The Adventures Of Musco" (/g/2798123/b4df3e13ac/), unfortunately it appears to be on a permanent hiatus. The brunette is also apparently an OC named Tequila.
This project is the definition of biting more than you can chew, this seems to be super ambitious in scope yet little progress has been made in years, there clearly is no syntony between commissioner and artist for whatever reason, which is unfortunate.