Hey bud. Yeah the way I've done yellow eyes for my 30k Dark Angels is pretty simple... Baneblade brown to block out the whole eye... then Averland Sunset, Y'riel Yellow and then if I want to take it higher, I jump straight to white.
Taking it all the way to White:
Stopping at Y'riel Yellow:
Hope that helps! Please share what you are working on if you get the chance. Good luck!