I think it looks great! I'm using yellow in a bargello quilt, it's a kids quilt, unfortunately one of my yellows has turned the colour of baby you-know-what. It was fine on the board, fine in the bigger stratas, but I'm doing a heart and once those thinner stratas come into play the colour changes. But I am finishing it anyway, maybe no one will notice LOL.
Your yellows are so fresh and clean.