[also posted in sketching]
The website I usually consult did forecast seeing I for the morning of Sept. 18, so I drove to Bethany Observing Station (CT). It turned out to be around IV... Pretty weird, as those forecasts are usually reliable.
Anyway, I was there and here's the 1st Mars of the season, with intensity estimates (BAA scale). Not sure about the white clouds on the E limb, but Syrtis Maior should have been right there and I could not see it. I could not find any observations made at the same time. Uncertainties are due to bad seeing, not the small size of the planet; I'm always impressed at how much this planet can show on such a tiny disk.
Overall, the planet looked very much like in Paul Abel's sketch of the previous day but more cloudy.
Bethany Observing Station (CT), Sep. 18, 10:00 U.T.
Refractor 10" f/13.5, 430x, no filters.
Dia. 4.2"; Ls 23; CM 333.