Ghengy is not my sprite, but Kunichio's. Well, I did do the face/neck area, but he did the rest because it was giving me trouble. I am somewhat good at spriting, yes, but honestly whether I turn out a good one depends on the day. XD I'm best at doing modifications to existing sprites; resizes, recolors, or tweaks to fix things up. You'll notice Ghengy's head is an enlarged, then fixed up, version of what it looks like in Kangaskhan's pouch.
Critique on your tileset: your forward-facing red rook is too pink; make it just a shade or two lighter than the sideways red roof tiles. I'd make the swimming pool more teal and lighter than the ocean. The viney thing is too 2d. Other than that, looks great. :)
If you're asking because you want me to sprite something for you, I'd be happy to, just keep in mind I've got my hands full already and I do have bad days. Items and mods are my specialty, but I can scratch sprite on a good day too. :)