Any professional artist over 18 years of age, of Spanish nationality or of any other nationality residing in Spain, may participate. Professional artists residing in any other country may also participate, provided they have exhibited in Spain within the last five years (verifiable information, which may be requested by the ENAIRE Foundation). Submissions from artistic teams composed of more than one person or under pseudonyms or heteronyms are permitted. The theme is open. Each participant may submit a maximum of three photographs. Only one photograph may be awarded a prize. The photographic image may be altered analogically or digitally. If, during the evaluation process, any questions arise regarding the digital modification process, the jury may request the original photograph and the image file for verification. The primary technique will be photography (digital or analog), which may be supplemented with complementary techniques such as collage, cyanotype, lighting, support preparation, digital processing, and any research techniques the artist deems appropriate.