Congratulations! A newly built craft studio to be. Give your DH a hug from me.
I would have lots of natural light, maybe a sliding door to step into your garden when the weather is nice, and closets with lots of shelves to keep my fabric, etc. out of the light. I just turned a bedroom into a quilting studio, and would love to have more closet storage, I have lots of natural light. I enjoy my room totally. if you have room, include a comfy recliner with a good reading light, and maybe a tv or built in speakers if you listen to music.