Try to unite your boards through color and style and then add variety by differing the size of your drawings. For example, on one board you might place one large drawing and three smaller ones. In this way, you avoid a static composition caused by same-size items arranged on a board in a regular, symmetrical grid. Usually, an asymmetrically balanced composition will be more visually interesting than a symmetrically balanced one. One element that will make a presentation board stand out like no other is 3-dimensionality.
Flat boards can give the impression of a flat and uninspired design.
A simple 3-D affect can be achieved by first mounting your drawings or images on a piece of foam core. After you've mounted the drawings, cut both the image and foam board to the desired size at the same time. Do not attempt to cut the image first, then cut a piece of foam core to match, because the size will never be exactly the same. After you've mounted your drawing on a small piece of foam core, you then apply it to the presentation board the same as you would a loose drawing. You must have sufficient space on the edges of the drawings for this method to work.