Hey! You can obtain Max’s third CG by having enough affinity with him. If you’re on a gay route and have sufficient gay points along with some affinity with Max, you’ll unlock the CG at the Twin’s Manor.
The CGs displayed on the devlog/game page are mostly from previous updates! Only the 5th CG is from the v.0.5 update!
If you have any other questions feel free to ask 😊