First painted WH kit EVER! Would love some feedback & advice

Hello!! I’m fairly new to the hobby but I love everything about it. A few weeks ago I posted some pictures of the first full kit I got and I finally got around to painting them.

It’s the first kit I’ve ever done and I am so excited to do many many more. I’m hooked. Please provide feedback! It’s the first one so it looks a little rough, but I had a blast doing it.

Specific topics if you could shed some light on them: 1. Thinning your paints? Idk, it got watery at points and difficult to control 2. Highlighting. I have a heavy hand, and found it difficult to keep my brush from marking up other parts or having too much paint 3. Steady hands! Not only are they heavy, they shake a lot. Any tips?

Thanks for checking my cultists out, they’re special to me now lol.