It's what the name is describing."You extend your hand toward a creature you can see within range and project a puff of noxious gas from your palm. The creature must succeed on a Constitution saving throw or take 1d12 poison damage."
That's not really describing what the image shows.
You extend your hand and a spray of noxious gas shoots from your palms.
15'?In terms of gameplay, this a 20' cone would be much more powerful than the current iteration. Too powerful for a cantrip, IMO.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.