I think you could benefit a lot from using some washes to really define your lines on a lot of the white, just some thin line work with a fine detail brush along the hard edges should really help this pop, It will take a little bit to get used to, but once you master it you can really make the helmets like that Terminator stand out. and the edges of the wings.
Your faces also need a little bit of work, I would try using something like Cadian flesh in thin light coats, and once it's dry using a flesh style wash (Reikland Fleshshade from Citadel works), once again in light coats. It does look like your paint needs to be thinned a touch more as well, a few thin coats is much better than one thick coat as far as finished look.
All of this is obviously going to develop over time as you paint more and more, you will pick up techniques from watching videos, and I am by no means an expert.
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