I took a picture of planet Mars, at alt 73 degrees in the southern city sky through a Mars filter, using my mobile phone at the eyepiece, exposure 1/160 sec, ISO 160.
In my picture there are two brighter patches, one at first quardrant and one at bottom, that contrast with the darker area across the Mars diameter. The darker area, overall, is bow-tie shaped and inclined 45 degrees. It is noticed that such bright and dark surface locations correspond and are in agreement with the Mars picture displayed on Celestron SkyPortal at same Hong Kong time 2020-11-26 9:14 p.m.

Cropped.

SW 10" Newtonian 1200 mm f.l.;
CG-4 mount with R.A. drive;
3x barlow;
Celestron Mars filter on Meade 9 mm Plossl eyepiece;
iPhone 7Plus

No Post-processing