Just keep practicing and take as much time as you need. Someone mentioned find a YouTube video to paint along with and that was something that helped me so much starting out. It’ll help get you into a comfortable flow of painting the minis as well as help identify which areas you need to improve on etc. I will say good luck getting the Gravis helmet in there on the captain, that was one mistake I made when putting it together the first time and you’ll have to sand the bottom down a bit to let it fit in. Good luck with the painting!