“This had better be good, human! If thou art wasting my time your suffering will be exquisite. All right, I’m watching. Yes, two girls. I have seen many females in my long life, mortal! What is so special about them and their cup? Wait. Are they…. Gah.”
This is actually a fairly accurate cover. The creature pictured is a Venusian ‘dragon’, who as described has 6 legs and “swiveled one fluttering eyestalk” toward the hero of the story when they meet. It doesn’t have the neck tendrils described in the book however. This juvenile novel was written over 60 years ago, and in many ways shows its age (we now know Venus is not a cloud covered jungle planet, for example) but I recently reread this after many years and Heinlein is still quite readable.
If one is going to make comments on book coves one should at least read the book to see if it is accurate.