Live Action Reference Photo 650-51 - Alice on the Sea of Tears
Next of the Key Book stills is this of Kathy standing on the Drink Me bottle while sailing the Sea of Tears - or a reasonable facsimile thereof. This is very similar to the still originally posted here.
This one still has its original snipe on the back.
Looks like they may have reversed the scene either in the still or in the final animation.