Heck, if in the good old days DPC members could find enough to comment on about a photo like this, you should all try a bit harder and do the same for the entries in our current challenges. Read the tutorial if you don't know how to comment! ;-)
A stopped motion should be of a subject that appears to be completely still and defies reality by being stil. Your subject doesn't lend well to this philosophy.
Different lighting or angle would have made this mre interesting. Have you gotten comments about how it doesn't look like it was moving? If so, consider it a compliment, that's what the challenge was for.
I tried this shot too and all I could think about was that the ceiling fan needed dusting. Good lighting on your fan and yours isn't dusty. You captured the stop action well.
The subject matter doesn't do much for me, sorry. How do I know the fan was on? Yes, I know the subject was stopped motion, but most other's had a photo where I know something actually was in motion.
I know you stopped the motion on this, but it's one of those subjects that when stopped looks pretty normal. I do like the composition, though! Like a big asterix.
I don't doubt that this fan was moving but it could be interpreted either way. In a situation like this, maybe tying streamers to the fan blades would have produced some dramatic indication of motion. Losing the fan blade in the right edge of the photo also reduced the overall impact of this shot.