I’ve been working on a lantern as an exercise. Sorry about the incomplete render. Please leave criticism as I would deeply appreciate it:
I have seen laterns and candles. I know they look different in diffferent climats and altitudes. In my climate and altitude in Florida of the United States, the flame would be much smaller. There would be a glow. You should be able to see the wick and flame on the wick. I think you might be using a bad color range, and this is making the flame look big.