In addition to m1garand's comments above, I'd like to make another suggestion.
Pick one of your projects, focus on that one alone and see it all the way through to completion, rather than working on a whole bunch of things piecemeal.
At the moment, you're learning the basics and you will make mistakes. It's better to make a mistake on one, know that you've made a mistake and learn how to fix and avoid it, and apply that knowledge to the next. It seems that every time you try to do something (particularly in regards to painting), you're doing it on 3-4 models at a time. It's no fun stripping down one model, let alone 3 at a time.
It's better to turn out one model at a time and see the progression of your abilities, rather than 3 or 4 at once, which all suffer from the same basic problems of technique.