Traditionally book publishers allow authors very little say about how their book cover will look; especially newer, unproven authors. Agatha Christie's third book was Murder on the Links published in 1923. Here's what she had to say about her book jacket.
“Apart from being in ugly colours, it was badly drawn, and represented, as far as I could make out, a man in pyjamas on a golf links, dying of an epileptic fit. Since the man who had been murdered had been fully dressed and stabbed with a dagger, I objected.” (agathachristie.com)
Not sure if the cover shown here is the original but if so it looks like she won the battle. Luckily I have recently discovered a publisher that is allowing writers to have a say in how their book look. A very refreshing and clever approach. They do a smashing job. Imajin Press.