Photograph the white horse, monument and surrounding landscape. Here is a link which details the parking availability and a suggested walking route. Parking at a lay-by at "1" and following the shorter route may be best for photographic purposes.
https://www.nationaltrust.org.uk/calstone-and-cherhill-downs/trails/cherhill-downland-walk

The nearest post-shoot hostelry is the Black Horse a short distance along the A4 heading towards Calne.
https://theblackhorsecherhill.co.uk/