He noticed that Dean was very much into his work, and he didn't want to interrupt him for fearing of screwing up his painting. So Seamus entered the studio, tip toeing to where he was sitting and watched as he worked. He tried not to stand directly behind Dean so as not to freak him out, so he stood more in a corner where Dean may or may not see him from the corner of his eye, and just smiled as he watched his friend work.