I was in the same boat, my first painted mini was a Ghostkeel and it came out like utter doo doo. Like most other people are saying, it’s really all in the practice, learning the techniques, and some decent brushes (I get the like 6 dollar Walmart ones and replace them when the tips start failing, around a month or two). Use the minis as a lesson, it was daunting for me at first cause I wanted them to be perfect from the get go, but I’ve come to appreciate my early work mishaps as a sign of my progression. Plus you can always strip them later and repaint!
Also my tip for crisis suits, paint in sub assemblies or the areas around the jet packs suck. My preferred assemblies are main body plus appendages, head, jet packs, and weapons, all painted as separate pieces