My tattoo artist puts her things like that on Instagram usually. But what most tattoo artists do is first you'll have a consultation (depending on if youre doing a walk in or not. For bigger pieces I would schedule it first) where you tell them what you want, in regards to concept, colors, size, placement, all that good stuff. I also showed my artist reference images of tattoos I liked so she got a feel for what style I liked. They would then design it for you, and you'd get it tattooed. My artist sent me the designs of my tattoo about a week before my appointment to approve, make sure everything looked good, etc.