This is text quoted from an earlier discussion on what's appropriate for posting in the Landscape forum, and particularly in the monthly challenges. Of course any individual monthly challenge may override any of these rules, for example the "People in Nature" specifically allowed photos where the person was the main subject.
Below are a few image posting guidelines for the landscape forum as well the monthly challenge. Generally speaking this forum is nature-based. However, there are a few grey areas we want to address so everyone knows what types of images are, and are not, acceptable to post here. Those that are not will be moved to the appropriate forum such as; A Picture I Took, Panorama, Macro/Close-Up, Architechtural....
Acceptable: nature landscapes, buildings like castles…that are in a landscape setting, bridges, cityscapes looking from the outside in like a skyline, fireworks, lunar or stellar captures like the milky way and certainly star trails, parks inside a city where the subject is the park, or the park in the city, NOT a city with a park.
Unacceptable: People in landscapes such that the person attracts enough attention to become the subject of the image. A person, or people, that are small and unavoidable, or in background are okay. City streets, shot from within a city, like a neighborhood with buildings are not considered landscapes. Single or small group of flowers close-up belong in the Macro/close-up forum, but rows of flowers, especially if they include a distinct pattern are okay.
Stitched panoramas belong in the Panorama forum. However, stitched landscape panoramas are welcome in the monthly challenge . Cropped-single images, i.e., unstitched images, that have a aspect ratio like a panorama are okay to post here. This distinction is made since in addition to the aspect ratio, the method of stitching and capture technique used to create the resulting panorama provides useful information for those trying to learn and be inspired. Therefore, stitched panoramas should only be posted in the Panorama forum (except challanges).
These guidelines may be slightly modified but the theme should be such that you would call the image a landscape capture Also, if you are not aware, Nikonians now offers a dedicated Infrared and Ultraviolet forum.