A splash particle + sound effect when stepping in a puddle with a wet footprint residue afterwards would be amazing. Also, quick question: why is the footprint black when you step in the sand for the first time? Wouldn’t you just be displacing the sand itself by the pressure of your foot? Not saying you need to add displacement for a footstep, but wouldn’t it just still be sand? Maybe a little imprint that’s more sand colored and less like you had coal on your feet?