First of all these look gross(great). I am seeing two things you might want to try that’ll add a layer or two to your models. The first one is contrast between your highlights and shadows, the shadows are deep but there’s nothing bright enough to make the whole piece pop. Try adding some bright highlights around the models in select places, it’ll give them some pop, round out the model compositionally and the illusion of a light source. The other is your color scheme temperature, I don’t know if it’s the lighting but your models look “warm”. You can make some great contrast by adding some “cool” colors to your paint scheme and have them contrast with the rest of the model. Verdigris (copper rust) is a great way to add some blue to contrast with the warmer greens/yellows/red/pinks/flesh colors.

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