There are other cloud formations visible besides clouds of dust. These are icy clouds near the summit of Olympus Mons called Nix Olympus or Snows of Olympus before the Mariner 9 spacecraft discovered a real mountain there. There are also W shaped clouds that appear in the Martian afternoon. These last clouds I have personally never seen. One of the best ways to help bring out the subtle Martian features is with the use of filters.
Filters increase contrast.
Red filters are used to make the dark Martian marking stand out. Wratten numbers 21, 23a and 25 in increasing density can be used. Other clouds can be enhanced with filters 38a and 64. Filter recommendations are from Observing and Photographing the Solar System by Dobbins, Parker and Capen, published by Willmann-Bell.