Fleetwood271, I am going to throw in my 0.02¢ worth here, having been a landscape photographer, amongst other genre, for many years. I think that all three of your images portray landscapes of some type or another (well, maybe not the barn), with the third one being what might be considered the more traditional type of landscape - foreground with a "land" component, a background with a "sky" component and a horizon that separates them (a la Ansel Adams)...I tend to agree with a lot of what has been said here, however, there are a group of photographers who are shooting what they call
Intimate Landscapes, a term coined, I believe by Eliot Porter. These are smaller, intimate scenes of part of the landscapes, often with no horizon or sky at all. I would offer you these examples of Porter's work...
Eliot Porter, Intimate Landscapes Portfolio being some examples of his intimate landscapes. This other article may also help in distinguishing intimate landscapes from the larger, typical landscapes we tend to think of...
5 Tips to Discover Intimate vs. Grand Landscape & Nature Photography
As someone who has been an amateur landscape, nature and wildlife photographer for many, many years I must confess that I have never really thought about what constitutes a landscape image and what doesn't, but I must say, I am more interested in pursuing Intimate Landscapes these days, because, to me, the artistic aspects are more challenging - my opinion, and I doubt that everyone will agree with me, but to me, from where I am in my landscape photography, the move away from more traditional landscapes, which I have done for years, to the intimate landscapes represents, for me, an evolution of me as a landscape photographer.
I would add two comments, HDR photography is now becoming the purvue of a lot of traditional landscape photographers, as you see more and more of this type of process being used in landscape photography - I think, for example, your third image would have been, perhaps, an excellent candidate for this approach. The other point is that of Urban Landscapes...there are a number of photographers who have begun, or are shooting urban settings as landscapes, and personally, I do not have any problem with this approach. A number of them are also using HDR to process their Urban Landscape images. For example, if you establish yourself at a high vantage point above an urban area and shoot a cityscape, what's the difference between the end result and a typical landscape? In my mind nothing, only the subject matter contained in the final image. Alternatively, if you capture a small part of a series of buildings, or a large bridge with buildings and water components in the image, is this a "landscape"? Is a sunset captured over a considerable expanse of ocean with water as the foreground and sky as the background, a landscape? I would answer yes to these questions, others will not.
Is there a conclusion here - I don't know, but I would hope that you can begin to understand that there really is no one single definition of what constitutes "landscape" photography. I am sure this doesn't help but confuse you, but for the purposes of an assignment, I think I might stick with the more traditional approach (unless your instructor is one who is interested in creativity) and try and implement some of the elements of composition in my final product - line, shape, colour, pattern and texture components and see how I could introduce some of them into my final product. Hope this helps a bit...
Regards,
WesternGuy