If this was NASA, the silence would be an ominous sign. NASA (JPL) typically sends back a picture ASAP because they live stream the whole event and know the world is watching. NASA loves press, and is very good at it. Unsurprisingly, China is being much more secretive. I don't think three days of silence is indicative of anything. This is their first rover. I'm sure they're taking their time. If a few weeks from now we still haven't received pictures or data, I'll start to suspect a failure.