It completely depends. Selling on any online venue requires a good solid marketing plan and work on your part. You need to have enough work to list consistently (don't list everything at once, space it out) to stay visible in the searches and categories. You need to spend time promoting everywhere you can, you can rarely rely on the traffic the actual site provides especially for fine art.
But at 20c a pop I think it's one of the most affordable ways, and doesn't hurt! If you aren't promoting daily you can at least use it as a place to direct people at your convenience if you don't have another online option where they can purchase. So it can be convenient.
Your work is nice! Just had a look at your shop. You need to put in your location (very important to buyers, also for being found in the 'shop local' section). You need to check if your 'no returns' policy is legal - selling original artworks doesn't make it so. In most places you are required to accept returns for internet purchases, within a certain timeframe. That policy will put off a lot of buyers. Fill in your profile! Let them know about you, you as an artist, what's interesting about your background or the art itself.
If you're new to selling that's okay, think what you might want to know about someone, even just a little bit that would make you interested to go look at their work again? Ditto on your item desriptions, make them more evocative. Browse through some art listings and see how other artists do their escriptions for ideas. And USE MORE TAGS! Remember that title and tags are search terms. Use all 14! So for "Caught" for example I would recommend: art, painting, oil, original painting, landscape, woods, forest, wild turkey, hunting, hunter, realism (or realistic), colours in the painting (hard to see on my screen as I'm sitting outside), location (does it depict a certain place/city/state?). Just ideas. Tags are very very important.
That probably seems a lot but don't worry, it's time well spent. You'll be able to use all that writing elsewhere too later on if you decide to try other sites, have a blog, or do your own site.
Plus it really makes you think about your work which is always a good thing.
Now Etsy itself may not be the best answer for you, but it's worth a try. Alterantives could be eBay, ArtFire, or even your own blog with paypal buttons.
Don't be afraid to ventues into the Etsy forums too. There's even a 'Critiques' forum that will look at your shop and give you advice. And there's an 'Art' thread in Techniques and Materials that is a very long thread but lots of people are chatting - feel free to pop in and say hello.