Style
Often I find black-and-white photography a great deal sexier than colour photos. Indoor pictures should show essentials and not be cluttered with distracting junk. Outdoor pictures can be amazing... beautiful body in beautiful surroundings.

Content
Pictures showing SM action usually don't impress me as much as 'apprehension' pictures suggesting that action may begin any moment. In general I prefer one person to pairs or groups. Nude or with clothes. I don't like the look of gags or hoods much, prefer to see the face if the model is willing. Pictures where the face is not in the frame, turned away, or hidden in shadows are a good alternative.

Favourite 1: Person tied up, male.
With what? Metal: cuffs, chains, rigid structures. Rope and other materials are fine too. Curiously enough, I strongly dislike collars as purely symbolic ornaments without a function. If there must be a collar in a picture, make it a steel one and chain it to something-or-other.
How? Available: in any position with arms and legs immobilised. End in itself: uncomfortable or painful positions; hogties for example. Can't get away: I like minimal bondage too. Just one wrist cuffed to something, or one ankle chained to something.

Favourite 2: 'other' : Submissive positions, male.
Salute: kneeling with hands behind back. Prostration: with hands and head on ground. Presentation: standing with hands behind neck and legs apart. Available: lying on front with legs spread open; lying on back grasping ankles lifting legs. Ready to submit to bondage: positions suggesting that cuffs may be snapped on any moment... Group pictures of one man being physically 'forced' into and held in a submissive position by others. Any other creative positions.

An aesthetically pleasing combination of favourites, for example submissive position with metal bondage, puts me at risk of walking around with an inane grin for the rest of the day.