Indeed, now when those clouds are sort of less dense on the right it looks way better. Text is consequently more visible and to compensate for that I made the planet brighter so that it draws attention a bit more. Now I feel that without changing its style (it's supposed to "feel" like a wast space) there is not much I can do. And a ship in my opinion wouldn't fit. I'm not a fan of ship renders in signatures anyway.
Now I'll move on to a more "tech" looking signature. The kind that is filled with effects and contains a ship render or a blueprint and such. Just for the purpose of learning how to create such things.