Nothing wrong with this pair other than the client is ready for a new look.
Giving the client option on how to place this REALLY big print! By the way, big prints make a big impact but can also add big cost! There's extra labor and a lot of extra material required.
Building up the seat well - where the cushion will sit.
Recovering this seat deck required hand stitching a deck material. The muslin also serves to reduce stress off of the final fabric.
There are many ways to attach a back panel - many using "tools" that are more suitable for heavier duty fabrics. Because this is a thin linen, hand stitching is the only way to go.
Patterns also require time and attention to flowing the design across seams.