One good thing to do if you feel like your work looks "dull" and uncontrasting is to check your values/contrast.

I did it with this at the early stages still when I was building up color, as I didn't feel there was enough contrast.

And I still moved my hue slider a bit, but stayed in the

purple/blue zone. That way if felt I got those slight warm/cold color relations there, even though if seen separately all the colors would look "cold" if placed beside let say, a warm orange.

So it isn't completely monochromatic one color, but rather a few colors that are very near each other in the color wheel.



Don't where you're at your painting or if your got things working already, just saying what I usually do in the same situation if it can be of any help ^^