Fire in minecraft is not too diverse. In the fireplace, it does not sound too cozy, but in the form of a forest pazhara or hell is not so frightening.
Why not make the closed fire in the fireplace low, crackling quietly. In open space, taller and louder. Several lights nearby merged into a high noisy flame in the height of a man. And those, in turn, into a huge howling wall of fire.
It would be nice if the burned tree did not disappear immediately, but turned into long-glowing coals, instead of it or next to it you could put a new block of wood that would immediately catch fire Conveniently for a fireplace, impressively after a forest fire.
You can also make the flame different in color and intensity depending on the fuel, but this is not so important.