I've noticed you do a kind of starwars figure/action force toy figure thing with the way you do your eyes,(dark eyebrows and dots for pupils) not my cup of tea but each to his own, again as long as you're getting stuff done fair play.
Your washes are a little hit and miss and seem to be pooling in some places and not staying put in others, maybe try a dot of washing up liquid in the paint to help them to flow better.
Finally, are you undercoating, sounds rude sorry but it looks like paint directly onto metal, (and little thick) but again the lack of depth may be the lack of shading/highlighting.
The good thing about your approach is that when you feel more confident you can go back to your blocked base coat work and start to add more depth and highlights.
Thanks for sharing, comments offered in good faith.
The Commander