You should be mindful of the Seven Components when you undertake a painting. The drawing and composition, in my opinion, are the most important elements. Within each component is a checklist of things to watch for and to be aware of.
DrawingIt is so important to have a strong drawing, and a well thought out layout. If the drawing is weak, you will struggle with the paint in an effort to make it work.
1. Upside down - Check the painting upside down for errors in the drawing
2. Negative space
3. Proportion midpoint, relative, foreshortening
4. Anatomy
5. Perspective sighting, people, buildings, interiors, aerial
6. Gesture
7. Seeing vs. knowing
Tone Values1. Shape of dark and light
2. Five tone values
3. Non-reflective light
4. Reflective light
5. Value dominance
6. Local value/home value
Found/lost Line1. Contour drawing basic/one-line
2. Hard/soft edges
Rhythm of Application1. Strokes
2. Paint quality
3. Sliced-bread theory
4. Slow strokes
5. Fast strokes
6. Long strokes
7. Short strokes
Composition1. Imitate/emulate: studying old/new master paintings
2. Golden mean
3. Focal area
4. Twelve-shape design
5. Tie shapes together
Design of light1. Color/ value dominance
2. Tangents
3. Balancing extremes
4. Cropping format
5. Working from photos
6. Setting up still life
7. One scene, four versions
Color1. Tone value in color
2. Colorist vs. tonalist
3. Limited palette: one color, two colors, three colors, four colors
4. Bracketing your colors
5. Color and complement
6. Color dominance
7. Color temperature
Motivation or Concept: Why are you doing this piece?1. Relaxation
2. Stress management
3. Nurturing your creativity
4. For a gift
5. Learn or improve certain skills
6. Impress friends
7. Rite of passage
8. Fun