A good idea for the challenge. Someone will have already pointed out to turn off the date/time on the picture. Another suggestion - try this shot for a bit of an angle to get a bit of depth on the tube.
Never include timestamps on your photographs (unless its for some specific "atristic" purpose); doing so immediately invokes a "snapshot" ambiance. The shot, itself, is OK, thought not terribly interesting.
As far as I know, text is not allowed on the photos, however I don't know whether date stamps are included in this rule. I suggest asking the administrators about this one, before anyone recommends your photo for disqualification. If you report it yourself, it's not treated as a crime. :-)
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