Yellow is almost as bad as white to paint with a brush. Your result does look good, but I guess the closer you look the less happy you are with the paintjob in close detail.
When I started an Iyanden army a few years ago, it took me a while to get to a state where I'm ok with how it.
This shot I took of wraithconstructs while rebasing them shows the progression:
The knights on the left and on the right end of the lineup too bright early attempts, as is the Wraithseer. The knight on the left was my first, and I messed up resulting in different shades of blue.
Later, I worked with zenital highlighting and the resulting natrual shading on each part.
My advice - get an airbrush - prime black with zenithal white highlight - apply successive layers of dark to light shades of yellow over the primer.
See
https://www.youtube.com/watch?v=Qr3SMnKI-tY