I wouldn’t spend more time trying to contact him.
In general, people don’t like sharing artwork - especially personal pieces. Even if the intent is good, there’s always a risk it gets reused or misappropriated. We’ve seen a few rip-off sets over the years (Eloe was actually a victim of one) where art was basically copy/pasted from threads.
Even for non-personal artwork, it can still be a hassle.. tracking down the latest version, hosting it, etc.
Also worth noting that a lot of folks don’t log in frequently because they want peace from notifications. When they do, they likely have a backlog of PMs, and responding to all of them takes time they’re trying to avoid.
I’d assume no response is your answer and move on.