Thanks Stefan, I agree with the path I tried to roughen it up a bit but there’s definitely too much repeating pattern going on.
This is all done in blender, scene setup attached
The mist is actually really simple, add a cube mesh to your scene then using cycles render add a volume scatter shader to the cube material, you can then adjust the density to change how much light gets through, i.e. how thick the mist is. You can also play about with the uniformness of the mist using image texture or gradient texture nodes, my scene used a gradient texture to give a feel that the mist was thinning as it rose.
It’s known as volumetric lighting, I’m keen to learn more on it so hoping it comes up further into the blender course but there’s plenty of tutorials on youtube if not