I can't donate paintings?

[RhinoK]

I am unable to donate paintings. Even if they're forgeries, you can attempt to donate them, right?

 

[Yui Z]

No if they're fake then I think it doesn't let you - also if you've already donated it

 

[NuttyS]

Even if they're forgeries, you can attempt to donate them, right?

Yes. Blathers will take it, say it's fake and hand it back.

If you've already donated it, he'll just say that you have nothing to donate.