If you're not sure, just test various similar color scheme on cheap models, like used kabalites warriors.
When you are satisfied with one, apply to your whole army.
You can even clean the color afterward on those who you doesn't like (or it'll just add up some variety).
Another solution is to use templates, and try filling them with your colors (with photoshop, gimp, etc.).
They are lot on the internet..
Example of one filled
Don't hesitate to share us more visual stuff, it's always easier to comment on those