Instagram is an incredible tool. I know tons of artists on etsy who have built their business off instagram. The power of hashtags can definitely help get someone noticed. Just by tagging Nordstrom on one of my shots where the model was wearing a dress from Nordstrom they asked if they could use the photo on their website (be smart about usage and rights, obviously). That's pretty big, for a huge company to notice an artist off of Instagram, of all places. You can certainly use it to your advantage.
You can upload images that are taken with any device, not just immediately from your phone. I upload images to IG from dropbox 90% of the time. Yes, it has to be either cropped or made into a square with Square It or similar apps, but the pros outweigh the cons to me.
People want to connect with the artist behind the work, I think IG is an excellent way to do it.
My IG: @andreabordenphotography