If you want to get better at planning, get better at prototyping. Get to the point where you can mock up a test build relatively quickly. Once you’ve got a shape, adding detail often starts to flow. Use reference pictures
If you want to get an aesthetic, follow pages like “What are you working on currently? (2018)”. To this day I constantly see shapes and materials coming together to make awesome stuff.
Get people like @HolidayPwner posting epic lighting scenes, you should go try and replicate it and then often more than not you will miss the mark, and create a new scene that’s unique. Then you take that and start to alternate it for different places. Boom. Got your aesthetic.