I don't know any nice way of putting this, so I'll be blunt

I think your latest version is worse than before. It's flatter, it doesn't show the same depth or the same texture as before. While you previously had its belly a different colour from its chin, they're now the same color. And now you're not showing any kind of irregularity in its skin, like scales or folds or whatever else.
Finally, the flame on its tail seems to cast no light what so ever. The parts of its body closer to the flame should be righter. The tip of the tail should not be the same colour / brightness as the base / root of its tail. The leg closer to the flame should not be the same colour / brightness as the most distant leg. Of course, this depends somewhat on the surrounding light. If we're seeing it in very, very strong sunlight, then the lighting of the flame is less important. On the other hand, if this is very strong sunlight, then you need far, far more contrast and stronger edges on the whole body of the lizard.
Hope this helps. Don't be discouraged, keep going.