This looks like one of those Untoon things. You must have heard of them. Hell, they're probably the most circulated fanart ever created unfortunately. That being said, this was pretty scary. I hope that was the intention. You certainly draw a lot of different cartoon characters.
He certainly does look realistic. I can see the pores on his body. Of course, real sponges don't have eyes, a mouth etc. I just now notice the shadow. It's a good effect. You've made something that's certainly freaky.