The speed, evenness, and clarity of execution in your technique.
The ability to play with consistently accurate time and feeling of pulse.
Your choice of tonal material in improvisation.
The spirit and drive of your playing. The emotional feeling and vitality comes from your conviction of rhythm and pulse.
The melodiousness of your lyricism.
The depth and variety of your repertoire.
Your ability to navigate,with integrity, a wide range of repertoire (vehicles) without losing effectiveness.
The quality of your inventiveness, creativity, originality which demonstrates your innovation.
Listening to Jazz by Jerry Coker page 77 & 78