Lately, I've been trying to fly over the cloudtops on gas giants. I suggest that the shader should lower the maximum bumpiness value of clouds on gas and ice giants to prevent them from becoming too spiky:
I think every gas and ice giant should have a cloud layer at 0 height, so that there's something to see if you land on the surface. I've only found one example of a planet like that so far:
EDIT: I've done some experimenting and it looks like SE doesn't currently allow gas giants to have more than one layer of clouds?
The "vortex" noise pattern used on clouds looks OK when bumpiness is reduced, but would it be possible to add a "Jordan hills" texture at a small enough scale that it only becomes visible up close? That might make them look more like clouds.