There is a great sense of energy in your lines, but the energy is lost in direction here.
The suggested focus is the lewd act the succubus is about perform to this fellow's crotch. However their posture, horns, arms, fingers are all guiding the eye to his right shoulder.
You have proof that you can guide the viewer where they should look in your piece "Rejected Phone Call".
You have so much potential. Please continue.