I need a cover for my children's novel

I am going to submit a children's (7-10 years) novel sample to agents - and to make it stand out from the rest a bit, I thought to include a cover. (So am at the very early stage of the exercise!)

The book is an adventure story and I want the cover to be similar in style to the Enid Blyton Famous Five ones done by Eileen Soper in the 1940s and 50s. This is essential - I don't want any style other than a copy of the Eileen Soper one. https://worldofblyton.com/2018/12/08/the-famous-five-covers-through-the-years-part-1-1940s-1990s/

You'll need to read the sample in order to familiarise yourself with the content - but it's not long - probably 15-minutes.

Thanks

Neal