Very nice. Was your lionfish photograph taken while diving, or at an aquarium?
[I don't dive (too elaborate for my tastes). It's in the aquarium at Palma Mallorca. Which probably accounts for its somewhat disgruntled look -W]
It's all very nice. But the 2015 photo of the weasel on the woodpecker's back is still in a class of its own.
[Thanks for the reminder. I've added a ref -W]
..."in its early larval stage."
As opposed to the late larval stage, which is nearly impossible to distinguish, since these fish only shed their thin exoskeletons in the deep dark abyss, where even David Attenborough dare not go.
They also have compound eyes.
Having discovered ichthyoplankton, I take that back - especially the part about Attenborough.
You don't have to do proper diving to see lionfish. Not knowing it was dangerous, I cornered one while snorkelling only a metre or two down and got within a few inches of it. It looked at least as grumpy as your aquarium example. (And why wouldn't it? I was probably the stupidest snorkeller it had ever encountered.)
Lionfish have recently been spotted in the waters between Newport & Wood's Hole.