My Instagram isn't really for my proper art, it's literally just where I post 10 - 15 minute sketches when I have downtime at work (and I usually am drawing them on the back of Notes of Evidence haha). I think if you go back far enough there's actual art in there. I'll also give you the names of the amazing artists I follow. They are my direct source of inspiration and are super nice people too.
zeocen (that's me)
12thcup (You may enjoy this guy, usually pen works, but great style)
elvintattoo (although a tattoo artist, his progression on making the art for tattooing is simply jaw-dropping. All he uses is a red mechanical pencil and it's outstanding)
becwinnel (my favourite artist, pumps out SO much detail in such SMALL pieces, it blows me away)