Ronald,
You definitely have skills as a painter. I personally don't think you need to narrow yourself to one, or even two subjects, paint what you love.
Your work shows a wonderful grasp of, not just technique, but also composition and use of color. I hope you will continue painting, you definitely should!
As to the reference photo question...I know as a painter, wanting to paint a variety of scenes and subjects, it isn't always possible to go and take your own ref. photos...for example if you live in the desert, but want to paint a seascape.
I belong to an online community, www.wetcanvas.com, which is a group of all types of different artists(painters, photographers, sculptors,jewelry makers, etc.) if you join, you have use of their Reference Image library. These images are contributed by the artist's and usually it is asked that you mention the photographer as ref. image provider, whenever you show or advertise your work using one of those ref. photos. There are also other places on the web, that have "free" images for use by artists(again, acknowledging the image provider is usually required, and should be done even if not required), but I think the wetcanvas community will benefit you in helping you to grow as an artist. They have forums there, divided into different catagories, like Oil painters, acrylic painters, etc. or by subject matter(animals, landscapes, marinescapes, etc.) I have found that community to be very helpful in their constructive critiques, and the artist's are always very willing to help if you need advice on your work.
Hope this helps you, and keep painting!