Mars is about twice the distance from the Sun as the Earth, as a result the anguar size of Mars varies considerably depending on the relative positions of Mars and Earth in their orbits around the Sun.
Through a small telescope you should be able to see Mars as a disk, the polar caps should also be visible and on nights with good seeing you shoudl be able to see some features on the surface.
Light Yellow (Wratten #3) Improves contract of albedo features on the surface.
Yellow-Green (Wratten #11) Good for reddish-brown surface features.
Red (Wratten #25A) Improve contrast of polar caps.
Dark Blue (Wratten 38A) Good for white clouds.
Medium Blue (Wratten 80A) Good for white clouds.
Lucky imaging using a digital sensor will provide the best results, a monochrome sensor will reduce your exposure time and help freeze the seeing. A red or IR Pass filter will help freeze seeing but at the expense of longer exposures.
In April 2019 Mars was close to M45 (the Pleiades) and NGC 1499 and this coincided with the Kelling Heath Star Party. Unfortunately at this time of year Taurus is very low, setting in the late evening making this a difficult object to image, my attempts to stack and then process with Deep Sky Stacker were hopeless, so I turned to Astro Pixel Processor (using a 30 day free trial) which has a very easy to use light pollution killer, this allowed me to remove the gradient that resulted from the very low elevation and trees that crept into the field.
Total exposure is 84 minutes, from 30s subs. Tracking was achieved with an iOptron Star tracker, camera was a Canon 600D with a full spectrum mod and a CLSCCD clip-in filter.
All images are copyright. Permission must be sought to from the image owner to the use of any of these images.