Evaluation is a series of short statements which explains and justifies what you do, why you have done it, and how you arrived at the decision. You should use this formula:
Short statement. "Because” short explanation.
Extension: further explanation which extends previous explanation.
Consequence: what arose, what happened or what benefit or disadvantage transpired because of your decision.
STATEMENT I began the painting with complete coverage of blue paint. EXPLANATION/EXTENSION I did this because I know that it is easier to establish a cold framework for all the other colours first.
JUSTIFICATION/CONSEQUENCE One key underlying colour, blue in this case, acts as a unifying element thathelps to make the picture into one image rather than a collection of separate parts.
STATEMENT Painting warmer colours like flesh tones over the blue helps to give depth and a balance of cool and warm colour to the picture. EXPLANATION/EXTENSION This balance makes the order and organisation much clearer and helps me choose the other colours and techniques to apply over the blue underpainting. JUSTIFICATION/CONSEQUENCE The blue underpainting is a way of setting the parameters for the painting like foundations to build a house on.
STATEMENT I also tend to paint in monochrome if I am not careful, and have a tendency to paint everything in shades of brown when I am painting detail and modelling. EXPLANATION/EXTENSION This overuse of one colour can make the painting look flat and one dimensional. EXPLANATION/EXTENSION Using the blue underneath can help to minimise this factor and helps me to ensure that I always have at least two layers of paint working for me in the picture. JUSTIFICATION/CONSEQUENCE The colours in layers combine and harmonise and stop the effect of one colour flatness.
JUSTIFICATION/CONSEQUENCE Once I have established the underpainting, I can then build the more important parts of the picture with more layers and detail.
STATEMENT I have looked at a lot of modern paintings where underpainting is used in the same way, sometimes with different colour orders.
STATEMENT: For example, Picasso’s 'Seated Woman in a Chemise' 1923 in the Tate Gallery, starts with burnt sienna and burnt umber underpainting. EXPLANATION/EXTENSION These are both warm colours and Picasso then paints cooler colours over the top. EXPLANATION/EXTENSION because he uses a light blue, which is lighter in tone than the brown underpainting, and the top layer of blue, which is the colour of the background, appears as a warm colour.
JUSTIFICATION/CONSEQUENCE This unifies with the warmth of the underpainting but needs balancing with cooler colours. EXPLANATION/EXTENSION Picasso compensates for this by using raw umber and cold scarlet mixed with white for the flesh tones. EXPLANATION/EXTENSION He even goes further and uses a flat black for the shadows.
STATEMENT Using black is very difficult because it can easily die on the picture and look like a hole so I avoid it where I can, EXPLANATION/EXTENSION, however, in Picasso’s painting, this set of colours gives the heavy drawing and solidity of the figure a stronger, colder, more solid feeling. JUSTIFICATION/CONSEQUENCE Picasso wants the figure to remind the viewer of a statue and this all helps to do that since the figure looks cold, static and lifeless.
JUSTIFICATION/CONSEQUENCE Picasso is trying to make the painting look like a stone figure, and his colour, combined with the drawing, helps him do that.
More examples with statements and explanations; hinge words and colour coding
Picasso, Seated Woman, 1923, Tate Gallery