Hey, Muriel
If you just want to market your own stuff and avoid the problem Barry is alluding to, you could create separate "Boards" for each category of your work, like the galleries you have here on FAA. Don't forget to use hashtag keywords in your description (like #tulip. #abstract) and seek publicly shared boards with larger built-in audiences so you can re-pin images to more than one Board -- including on your own account, like if you have "Favorite" or "Best Sellers" boards in addition to your normal categories.
Early on, I made the mistake of lumping all my photography on the same Board but now I've branched out a little and just have mostly cars on one and my oil-on-pavement shots on the other, but if I had it to do over again I would have started out with more categories. All my other photography Boards are shared.
I usually pin an image on its appropriate Board (I also do T-shirts apart from photography), then re-pin to "Advertise Anything", "Support Small Businesses", "Pinterest Bazaar 24/7" and a few other group boards. Hope this helps.