Giving emotion to generally-expressionless creatures is quite a challenge. The pose does a pretty good job.

Hold up.

Why would you want to make her sad?
Unless it's for pure purpose of displaying emotion.
Also I would have anticipated the antennae movements or posture to be a little sluggish/slumped.
That and the labial palps to be very tight to the maw. (similar to how some people when they display a depressed/sad emotion their lips grow tight to the face, sometimes pursed).

Then again, I probably spent -way- too much time conceptualizing this and overall the body language was enough.

I-i dunno, it's just some crappy sketch i didn't really want to post here/finish, and only did because someone asked me to.

Oh.

Carry on then as I love your insect works.

I never meant to push though a bad vibe.