I have the cover with St.Materiana's Church seen through the lower gate, and the Dead Path, on the Smashwords version. The Litch Gate is the other name for this gate, because bodies were carried along this route. Traditionally, these Dead roads were left unobstructed so the souls of the dead could fly directly to hallowed ground. So very appropriate for a story involving a zombie. This is quite an eye-catching image, even if you don't know exactly what it shows.
Saint Materianas is in Tintagel, Cornwall, and is a very old church.
I have the anonymous cemetery on the Amazon version. Tumbled gravestones in hues of grey and green, fairly spooky.
Whether the cover influences sales (much) is very hard to judge.
I know, I know, big yawn, who cares about the miniscule sales of a very short ebook? Obviously I do, and so --
As of yesterday, Friday 3rd there'd been 6 sold by Amazon.com during June, which would be 2 per day. Since it went 'live'during the evening on May 18th, there were 10 sold on .com & 2 on .UK, so a bit less than 1 per day.
Forget about Smashwords, nobody goes there to buy, it seems. Fellow writers, certainly, and there've been 14 'sold' there, 13 with use of the coupon. Now, the other retailers they supply might be different, but it'll be a while before it gets out to them.