When making a collage going up a staircase keep in mind to mimic the staircase lines in your collage. Also make sure to measure on every second or third step the distance from the collage to the stair to make sure it has the same distance consistently.
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Stairway wall gallery - tip, use command picture hanging strips so pictures don't get jostled all the time. Also, before hanging the actual pictures, cut out brown packing paper that is the same size as each frame and hang that so you can see the spacing.
The upward angle of the frames should match the angle of the stairs in a staircase display. Keep larger frames as the focal point and use smaller ones as an accent – note how the corners of the smaller frames are placed in relation to the dotted line