It’d be a bit unreliable, though. Not everyone has the same reaction to the same thing, nor do they express it in a similar way.
Someone might think a snake or a spider is cute, whereas another would want to incinerate it on the spot. A third might be concerned because they seem to be injured, etc.
Not to mention that image recognition/emotional analysis has been an ongoing field of research for some time. Making the link is not overly difficult.
If you can somehow lick a gas, more power to you.