A very striking snapshot captured with great panache; the red parasol brought into sharp focus by the contrasting cool whites and icy blues of the foreground. This view is just to the east of St Mark's Square, viewed from the terrace of San Giorgio Maggiore. The red palazzo in the upper left is now the Hotel Danieli and in the upper right is the dome of the church of San Zaccaria (see photo below).
Mary Constance Lloyd was a great friend of the artist Gwen John (sister of Augustus). The National Library of Wales has a collection of letters between the two as well as a nude study of Gwen by Mary, painted with a very similar palette to this painting (which you can view here). Amongst the Tate Gallery's collection are two drawings by Gwen John donated by Mary.
She exhibited regularly at the Alpine Club Gallery and at the London Salon. Her work rarely comes on to the market but examples in public collections can be viewed on the Art UK website.