Unfortunately it is actually pretty unlikely for most shops to get a few sales a month when they first start out. There are a large number of stories about people going a whole year before even getting their first sale, so don't feel discouraged. It isn't you ,it's Etsy.
Like I said though, I don't think you really need to spend too much time on SEO and adding items, because it will always be difficult to get found on Etsy. I think the best thing would be off Etsy marketing, which shouldn't take more than 1 hour a day.
Your shop is adorable and many of your photos is really great, once more people start to find you, I'm sure things will pick up.
I just read a great article on handmadeology written by a jewelry seller "1,000 Sales in My First Year of Business on Etsy: Low Cost Marketing Strategies", check it out if you haven't seen it yet you may find it helpful:
http://www.handmadeology.com/1000-sales-in-my-first-year-of-business-on-etsy-low-cost-marketing-stra...