Although I don't have a table to physically draw digital art (I'm quite broke, and thus rely on the awkward tools of Pixlr myself ^^;; ), I think that there should be some 'topics' for an Art Class to gather more interest in it. After all, 'classes' usually implies 'teaching', no?
For example, in Krava's "My art contribution (
http://elementscommunity.org/forum/index.php/topic,6660.0.html)" thread, you've greatly helped him hone his technique by addressing several issues:
-Overdoing minor details
-Uniform 'brushwork' (overlapping colors instead of using smudge to mix colors)
-Lighting angles and contrasting (using saturation to figure the range of tones you're using)
-Hard line definition
-Material textures (lighting on metal, skin, etc.)
In other words, if you have a list of 'ideas' that you've learned as an artist, perhaps you (and the community) can share these concepts together to improve the quality of art that's being created for card ideas.
Oh, and I would much rather prefer 'subforum' (or just -
this- forum) to gather all these different 'class topics' into, rather than a single topic where the post count will skyrocket uncontrollably...