Let the work define the promise
For a visual journal, Studies in daylight makes a direct and supportable introduction. For an educational sketchbook, Observe light, draw the change points toward an activity. Phrases about unlimited energy or guaranteed wellbeing would introduce promises that the name and an image collection cannot substantiate. Keep the editorial language close to the actual work. A page showing three shadow sketches should explain the sketches, their conditions and their intended use rather than borrowing authority from a technical subject it does not investigate.