The original request was quite simply a lighthouse which Jack was excited about drawing as he has not done one of these yet. Jack sought inspiration in the fact that his Daddy abseiled down Barns Ness Lighthouse last year for charity and asked if he could see the pictures. Hence the reason there is a strange man abseiling down your lighthouse. Sorry Ava!
Here is the picture Jack used as reference, which he asked me to post here for you to see how brave his Daddy was: