Putting your home on the market is a stressful event, because you think that an offer can come in at any time. Every day you come home and look to see if there are any Realtor cards on the table reflecting a showing, and when you see none, it's frustrating. There are a lot of people that can feel your frustration.
I have a few comments to offer you.
1. I agree you should first disucss this with your agent. Give them an opporunity to correct the responsiveness. No excuse for that, even if there is no news, they should respond and tell you there is no news. If you don't get a satisfactory answer, I would follow the advise that you've heard in the other comments about speaking to the broker to either have the listing reassigned, or to break the listing agreement. At 100 days, I'm guessing you don't have much longer before your agreement expires anyway.
2. A refresh of the pictures is worthwhile. A snowy exterior reinforces that the home has been on the market for a while, and if no one else wants it, why would I.
3. Is the home in the right condition to sell? You're not the best judge of this, because most likely you've not been in other homes for sale to see what the competition looks like. Ask your agent to take you out to 3-5 homes in the area that are in your price range. See what other buyers are seeing, and decide whether there are any improvements needed on your home to make it more attractive. Listen to what your agent has to say, and ask them to be brutally honest. That way they'll know you're giving them permission to share their real feelings. Too many agents are too afraid of hurting your feelings with the truth. The trade off is the house sits unsold.
4. Price, condition and location are the other key aspects. You can't control location, but you can impact the other two factors. Only 6 showings in 100 days indicates to me that you have a problem with either location or price. Again, ask your agent for the unvarnished truth.
What about your agents marketing plan? How are they marketing the house? Are they doing open houses, have they done a brokers open? What type of person/family will buy your house? Where do they likely live now? Is your agent marketing there? Are they marketing on the internet? Forget about print advertising. No one looks there anymore.