A Place for new Spriters

[Proton]

there's plenty PixelJoint and their Weekly Challenges for that.

Not only does PixelJoint have a submission review process,
making it harder for them to stay/go there and enjoy being there,

their Weekly Challenges are still just giving them an empty canvas with a small gimmick attached, like colours.

You give them colours, they'll use colouring whatever.
Maybe good, maybe not. It's not an organized way to show a beginner.

You give them something to colour, they learn colouring.
And with giving them something to colour, they can be sure the rest of the sprite looks fine. With errors, they can start over and wouldn't matter.