i have the yellow gaucho, and IRL, it's NOT AT ALL like that bright yellow on elux. NOT a lemon yellow/canary yellow/candy yellow. here's a pictures of mine. my picture isn't really that accurate on the color either. it's really hard to capture. i realize my pic doesn't help much, LOL, since it came out waaaay more yellow than it really is. but i'll try to get a better pic for you guys sometime this week.
it's definitely a muted yellow, a true mustard yellow IRL. completely wearable and looks almost like a camel color in certain lighting. it's GORGEOUS! it goes very well with the brown trim, too.