Less is more. This statement can probably be applied to all sorts of visual appeal. Showing only hints of the actual object in terms of composition creates a sense of mystery and makes the viewers imagine what it actually could be and gives them a certain emotion, whether fear or awe. Also, showing only the best of all your work is the optimal way to sell yourself. Don’t show any mediocre works because if you’re in doubt of your own work, it’s unlikely that they’ll love it.
Variety. No one wants to see the same composition style over and over. Each photograph loses their uniqueness and it will start to get boring. Various styles, when mixed well, makes a good impression: Each photograph will have their own style and at the same time, the presentation as a whole will have a clear characteristic.