You can use your bare hand in this part if you would like, but where you outlined your parts take your index finger and start rubbing the paint in all directions (do it as though you’re spreading butter on some bread :3) You must hurry though, loki costume because the paint can dry quickly! But even then it will still help with making your Prop/Armor become more distinct. After doing this I found a way that you could quickly do this in the more bigger parts on your Prop/Armor!
