The little icons under the img cloud are sometimes hard to see depending upon the background of whatever location one is in, and I frequently get the Rookswort and Rubeweed icons confused when I'm out and about gathering.
The text when you munch Rookswort says the whole world seems brighter - it would be neat if munching Rookswort actually DID make the world brighter, and when it ran out everything dimmed, so it would be even easier to tell when your Rookswort has run out to prevent mood loss.