¡PLAN PLAN PLAN!
My english teacher marked Q5’s last year, and she said as soon as she saw a plan - she knew it was going to be a good story.
As Question 5s are particularly weighty, I would definitely revise them. Grab a random picture up from the internet and plan both a description and narrative, then get another picture up and do the same thing. If it is a description, plan the different metaphors or similes you could use as you may forget really good ones that you come up with due to the stress whilst writing it - so make sure you make a note! Also, don’t follow the images biblically. If it is a beach, you could do a description of a stormy beach and strong waves, or a peaceful beach. AS LONG AS IT ISN’T RIDICULOUSLY DIFFERENT like aliens landing or something - this will set you apart from the rest of the UK and will work in your favour.
In regards to Narratives, to improve this read some books. I know this sounds horrible to some, but if you find a good book that you know will interest you (so if you liked 13 reasons why, read the book) you will learn new metaphors, similes and how to structure a story.
I hope this helps?