No comments are allowed in the current challenges. Save them for after the winners are announced. You may not put any explanation text in the post with your photo.
One of the challenge rules is to CHANGE the title to reflect your photo. A lot of folks are not doing this and it should get them disqualified. The title of your photo can be very important in helping others figure out what it is.
Thanks! If you are unsure of what do do but want to join a challenge, PM some of the frequent flyers and ask.