Following feedback from the Crit, I moved the 'key' to the left. The suggestion was also made to add the "brand logo' of the guitar such as Fender, Guild etc however I think this may contravene Copyright. Instead I have written the make and model of the guitar.
I intend to extend this range of posters to include a purple and blue one. Ideas for other images include Chord boxes - open, major and minor and b chords, Scales, a who inspired who family tree different genres