use that to provide context to the photo. of course, there are trees everywhere (you almost cannot avoid them) so that should be easy to do.
the final item i want to mention is the one that you may struggle with, and that is adding people to your pictures. this is an incredibly powerful tool. we, humans, are amazingly adept at recognizing people in a picture and we will use that to provide context to the entire scene.
therefore, there is no more powerful way to add a sense of scale than by including people to your pictures. your viewer will see those people in the pictures and naturally use them to 