Hi and welcome! I like your knights best, do the rest of your bases like you did on them!
I agree with Dozing Dragon - get some Citadel Washes and go to town on these babies =D The chaos knights look like you have shaded them a bit, so maybe you have the washes available.
You have good brush control, I think it's time for you to step up your game a bit.
Here are the tips which helped me get out of the stage where you are now. I apologize in advance if I'm telling you things you allready know. =)
* Wash the minis in warm water and a little dishwashing liquid. Rinse and dry thoroughly.
* Undercoat the minis with a spray primer. White is easier to get good coverage on.
* Thin your paints and use good, clean brushes! Get some paint on a palette, using an old brush or smth. Thin the paint on your palette a bit with water, to a milk like consistency (or cream, if you're a bit chicken - I was).
* Use washes and inks to shade the areas where two features meet. Wash, let dry and then pick out details with the base colour again.
Once you have those steps nailed, you can try drybrushing, and later on layered highlighting.