Of all the chalk drawings I did at the GalaCon the character I had been planning to draw for the longest time, Spitfire, turned out really bad.  
There were little mistakes in all of the drawings, but nothing that made me really unhappy with the overall results. The only exception to this was Spitfire. When I drew her wearing a flight uniform I mispositioned one of the googled eyes, then decided that what should have become the right eye had to become the left one, but I already had drawn the snout, so the whole perspective of her head was utterly messed up and the final result looked a bit like a Picasso which, in this context, was not a good thing. If you want to take a look at that Spitfire, here is a link to the distorted view of her, but I don’t really want to put her up in the gallery here.  
Yesterday I drew a chalk fire on the table tennis table of a nearby playground and I thin this one turned out nicely (here she is without the flight but with the ground uniform).  
This image is a color enhanced version. Here is a regular color version of this drawing and here is a black and white version.