Very nice pictures. I took some pictures around the same sections in Kilgore during a very hot October day a few years ago, and I like your pictures better.
If you want to venture north of I-30, downtown Leonard is a nice place, with an old-style town square. Ladonia is interesting, as is Honey Grove. Both of those towns have run-down and vacant buildings that may or may not suit your vision. I have also thought of a project to take pictures "From Athens to Paris - Texas" purely because of the names.
I look forward to seeing your pictures of East Texas.
Here is a picture of downtown Leonard.
, on Flickr