crude and offensive in a sexual way.
the image i posted is only crude and sexual if you want it to be. there is no context provided.
if she is blushing because of a compliment or just being cute then it is not lewd. if she is blushing because of arousal or sexual pleasure then it is lewd.
if she is naked because nudity is simply commonplace for animals then it is not lewd. if she is naked for the sole purpose of arousing herself or someone else then it is lewd.
the image is questionable but not decisively lewd