Oh dear Islandplodder, you wouldn’t like walking with me
But seriously in general yes, you don’t need photos for a trip report......but in my opinion, one of the main reasons I go hillwalking is for the sense of freedom and exploration in big open vistas and photos help to convey that feeling to the reader, so even one or two might help.
However, my tip would be avoid making them boring. There are so many online sites with directions, turn left at the gate and walk half a mile and you’ll come to a stile etc.
Write about your walk, what you did, maybe add some humour, some history that makes it unique and that’s what I enjoy reading when I come across a good blog.
And I also try to do the same when writing mine