Three important things to do when hand rendering plans (and elevations) are:
A layer color up by starting with a lighter marker color and adding multiple layers, this works far better than starting dark -trust me.
B always include shadows, not paying attention to windows or light-sources but by simply locating them consistently throughout drawing (all to the bottom/left for example).
C use a straight-edge made of matboard; cut the matboard in strips and use as an edge for the marker, this will keep lines straight and give greater control | while shown here for wood flooring this method can even be used for carpet, tile etc as a way to start a clean base layer.
This is straight from my book “Interior Design Visual Presentation” 4th edition.
In thinking about sample board and presentation organization, it may be helpful to consider the rule of three. The rule of three is a compositional tool used in photography and the visual arts. This rule can help with the organization design presentations especially where items of differing sizes or scales/points of view are employed.
One absolute compositional rule I follow is the idea of creating a consistent visual border in design presentations as illustrated in the following:
1, Lets say you have a sample board or digital presentation sheet as shown
2. At the very least create an imaginary border of at least ½” around the sides and top and maybe leave a larger open border space at the bottom (this works best if you are going to have a title or title block there). OR rather than using a bottom open space for the title, just use the same dimension you have on the top and bottom and insert the title inside that imaginary border.
Presentations will be more well-composed looking if you follow this step (2).
3. Consider using an imaginary grid that divides the board into a 3 column by 3-row grid and use this grid to lay out samples or drawings (this works whether samples are real or digital).
4. When using the 3 by 3 grid, you can imbed the title into one of the grid sections or include it in a title block along the bottom or side. But in all cases leave that open border of space to serve as a visual border controlling the composition of the board!
More on the rule of three in photography: