Hello. Windowsity is a well established group with a solid core of talented photographers whose work is featured in its gallery.
Please, before you submit your work, take a good long look at the gallery to make sure your work is in keeping with the skill level of those who have contributed in the past.
Certain things will definitely keep your work from being accepted.
Here are a few things that will definitely not qualify:
A picture submitted to Windows that is NOT a window.
A picture submitted to Doors that is NOT a door.
A picture whose main focus is NOT a window or door.
A picture where the human element is the core focus -- not the window (this just about cuts out any shots with people or parts of people in them -- unless they are an incidental ghostly silhouette)
A picture with a dA watermark -- make your OWN watermark. This is not a place to post dA advertisements. This is a place to post quality photography limited to windows and doors.
A poorly composed random shot of a window.
If you want to know what IS accepted, look through the gallery. It speaks for itself.