In addition to what SamuraiBlue said above, when will we see pictures of J-15s taking off and landing with dummy munitions to simulate combat loads?
We have had pictures and videos of it in the past... a year ago or more they were seen carrying A2A missiles, AShMs, and dummies for 500kg bombs (possibly to simulate PGMs).
You can find all these on the internet through your own search.
They likely have also done take offs and landings with more ordnance as well, as they say they've taken off at MTOW a year or so ago, I believe... so chances are we just aren't getting pictures or videos of those exact tests.