To be honest, I'm not liking the blue overlay all that much, it feels like he added a new layer that was blue and set the opacity of it to 30% or whatever in Photoshop.
I think what you need to work on the important stuff, like adding depth to everything. Jack, I think with your colors you're just thinking that(Mighty Pea stated something similar earlier, well, basically the same thing), a dark red brick is a dark red brick and that skin is yellow, etc. Jack, what you need to do is think uh, hm, yeah you gotta work on it, you might wanna
study up on the color theory(Google is your friend). That and you just gotta understand that
colors aren't solid, they're flexible(Well, like, yeah, hopefully that made sense), a brown tree isn't a
straight brown and as it gets darker/lighter the hue and saturation will change aswell.
I'm just not feeling the scene, like said before, I don't like the whole blue overlay and I don't think its helping too much. What you need to understand is, not everything is gonna....... just all be super blue, if you wanna get a scene that would be considered night, well thats just a simple palette change, which I think you should change the palette instead of doing an overlay.
Examples:
Day:

Night:

And so on.....
Just depending on the object will depend on how severe of a color change it is, like something grayer would probably be alot bluer during the night, etc. I still think you don't have enough room for all those ranks and stuff, I'd rather you use that space for shading, instead of a rank sticker/button.
Hopefully this helped a little bit.
