It took me a while to find the original source of this Totoro Nail Art (down the Tumblr hatch I went), but I eventually nailed it! Turns out, the blog Korean blogger Luuthienluv specializes in creating these fantastic nail art (the Totoro one is her 139th)
Love Totoro? See neat and hard to find Totoro items on the NeatoShop (it's very difficult to keep Totoro items in stock, so if you see anything you like, grab it)