A database of images which you can tag to find specific search criteria

I am looking for someone to assist me in creating a database of images that I can use for various applications. These images must be user-generated content and should be tagged in order to be searchable based on specific criteria, such as colour, style, and era. I am expecting for this database to contain more than 500 different images. Your job would be to provide assistance or advice in designing my database and gathering the necessary images and tags.