I think you're doing alright so far, and would agree with all the advice you've been given thus far. The two big ones that hit me first when I saw the pics were: go a bit sparser on some of the material, and paying a bit more attention to your thread control for a tidier looking fly. Not to say that any one of those flies
needs anything different, I'd bet that all of them would fish quite well.
I might suggest getting John Shewey's Steelhead flies and how to tie them as well. I have both his Steelhead flies, and Spey and Dee flies; while both are great books, for an instructional tool his Steelhead flies is a far more helpful resource. A lot more technique is covered and has a lot more step by step instruction. Can't recommend it highly enough if you're looking for more input.
About the wax, it helps to grab materials more securely with less wraps. Depending on what you're tying I'd say that wax varies from "not needed" to "kind of helpful" to "MUST HAVE!!!" I pretty much use it for all dubbing loops, almost always for mounting JC (or any other cheeks, sides, or shoulders), and have almost never been able to mount GP crest straight and true without wax. I'd say to play around with it, and see how few wraps you can lock materials down with it.
Definitely keep tying and keep posting, I'm looking forward to seeing what you start producing soon

JB