I am a manager and I have 4 direct reports. Product management in tech. My team is generally pretty junior - but growing and showing some amazing progress. Totally proud of them, but we are a new team and all learning. Every 3-6 months we give a product update that is a 60 min meeting about all things going on with the area we own. The last few times, I have led the charge in getting everything in order, assigning who builds what slides, and being accountable for the visible state of things and the story, narrative, etc.

This time I wanted to give some emerging leader on my team the responsibility of wrangling the slides together, in me in a supporting/feedback role. This was to help develop some of their skills and see what would happen if I were to give more formal leadership responsibility of this to the direct team and be more of a director. I saw the whole thing get created and provided feedback along the way... the content is good but the visuals ... i.e how the slides look like and their general polish... dropped a ton. I think the data and story is really great, and thats where I provided the feedback, but it just doesn't "look as good" and that's hard for me to articulate.

What is the best way to approach? It's hard for me to say "Make these look prettier" but rather I think its a coaching moment for something else.

Thank you in advance!