Please don't get upset if I'm overly critical of your work. You're actually not that bad; you just need a lot more practice before you can make anything that's decent. EVENTUALLY I want you to make sprites for our game, but now you should just practice.
I won't stop giving you constructive criticism, but that doesn't mean I don't need your help. After all, practice makes perfect.
For now, I'm keeping you on the staff list. I want you to practice and get better at things you do, not just spriting but anything else you want to work on. If you want advice, just post your work in Pixel Art or someplace else where you can get honest advice from people who have been doing these things for years.