Lava's looking way better!
My suggestion with the thermal suit is to not underestimate the human brain's ability to fill in missing details. Suggesting just a few folds instead of keeping the whole thing perfect will read as "ooh, wrinkly".
Here are a couple of edits, one to make the bear look more like he's lit by the lava, and another adding a themal suit, to show how you can make it look pretty wrinkly without losing the sense of light/shadow/form:

I also tweaked the lava colours a little and made a few minor changes. The biggest change was to remove the yellow lava bits from the bottom spill, this makes the lava look more like it's cooling down, which I think is appropriate given how thick it is compared to how thin it is at the top. I cleaned up some bits that felt a little noisy - big, stringy clusters give more sense of flow.
While editing, I noticed the container only has three feet xP Didn't fix that.
I recommend not working on a white background. Use a background colour that represents the general feel of the scene, even if you're not going to be drawing the entire scene. It'll make it easier to pick colours and values. White drowns everything out and makes it hard to see if your values are any good, as everything looks very dark compared to white.