Good comments. The “Boutique art studio” was to convey that’s its not a large advertising company with a whole team of graphic designers, but rather a small personal studio with one artist doing the art and graphic design.
Like you have Boutique Hotels, they’re very different from chain hotels where all the rooms are with the same furnishings etc. A boutique hotel is a personal little hotel with an individual character, usually but not always family run.
However… now I think it might be better to promote the graphic design side of what I do for business needs, so I thought either I would do away with the Boutique line and/or add a catch phrase in my promotional work that will stick and become a sort of slogan.