With good seeing everything is possible. Even with low planet and high humidity many details can be visible if the atmosphere is calm. In this photo of Mars we can see several formations that can be compared with the central photo obtained in Virtual Planet Atlas. There are two cloud formations, one over Chryse Planitia and the other over Isidis Planitia. However, what draws the most attention is Hellas Planitia located to the south that many may think is the South Pole in visual observation.
A photo that I really liked for a distance of 2 AU and only 4.7 "of arc.