I usually associate innocence and fragility to this emotion. Not sure why. :) But I get your point in this exercise. Great work here!
To me tenderness comes with having a great concern for someone. You're wanting what is good for them and helping to achieve that good if you can. The most I have observed tenderness is in would be a mother toward her child. It's like a mixture of gentle, as in soft and good intentions or good thoughts.
Tenderness seems to be manifested through touch - a gentle pat, a comforting or affectionate hug, a caress.The eyes express tenderness. It looks like a cross between sorrow, concern, and love.