I thought to myself after 30min of walking.Write it as thirty minutes or half an hour. Will sound better that way. It is always good to write out numbers in the narrative.
I grabbed an old paint brush and a paint pallet from my wardrobe, along with the sketch book Miss Alexander had given me for a birthday gift and placed them on my table.The sketch book is on the table, and paint drips onto the carpet later on? Maybe put in a line that he placed it on an easel or something.