From what I can tell from the links you provided they were probably deleted for being too simple/looking unfinished. For
instance they could both use at least a little bit of shading... otherwise it just looks like a quick lineart that could
have been done in 15 minutes.
Another thing I noticed is that your descriptions are a little bit lacking. From what you have written, we have no way
of knowing if you are the actual artist or not. The description for the second piece is especially difficult because
from what you wrote it seems like you could have just found the artwork online and uploaded it for all the fans as a
"gift". It would be helpful if you would put a little more into your descriptions for your artwork (i.e. your
inspiration, difficulties you faced, medium used, etc.)
That's all I saw so far, but I'll leave this thread open so the Mod who deleted your pieces can respond as
well...