First time reading about this "Art block" term you bring on this post, but I think I can somehow relate to. My experience is, usually having good and varied ideas but not being able to convey them on the pixelcanvas, then i forget about the "avoid the perfect mindset" principle about art, and instantly get frustrated then I scratch the work or I leave it unfinished, all because it just "doesn't look good", then I just dont do anything. Thats my "block".
Just remembering that principle keeps me on track.
EDIT: Pretty artwork btw.