A few tips:
Thin your paints a bit more, especially the gold on the Aquila. It's obscuring some of the details on the chest and gun.
Look into colour theory. You want to use a combination of light and dark (which you're doing already!), complementary colours (what about some purple or blue details somewhere? Gun lens? Purity seal wax? Eyes?), and a combination of cool and warmth. In general the model is quite neutral, but that could be chainged easily by...
Throw a dark shade over the yellow, then drybrush lightly with a bright yellow. That way you'll get some really nice warmth and contrast on the sharp edges of the model.
Consider edge highlighting the edges of the shoulderpads.
https://www.designwizard.com/blog/best-laptop-for-graphic-design
Essentially any laptop with a good amount of RAM (at least 16GB) and a fast processor will work.
Hey man! If you’ve still got the time, which I wouldn’t be surprised if you didn’t after seeing all the comments lmao, I’d love a new look for my band’s logo.
If you can do it, thank you so much!
Maybe switch out the orange for a soft lighter yellow? Alternatively, switching out the blue you have now with a darker shade of blue could help make everything less jarring. Color combination guides like THIS ONE may give you guys further inspo!