Ce Chel,
Make sure you are in groups that specifically focus on nature photography. Buyers looking for them will look there first since they don't have to look through images that are not nature shots. This doesn't mean you cannot be in other groups, just be sure you are in those as a priority.
Set up your gallery (or galleries) accordingly and perhaps keep them at the top of your listings by specifying the order.
If you have other social media sites where you can post your link to these pictures be sure you are doing so daily as your schedule permits.
Enter contests on FAA where your pictures can be viewed competitively and this will also expand your creativity both in composition and editing skills.
Hope this is helpful.
