Ключевые слова: among, assessment, attractiveness, best, business, cheerful, cheerfulness, concept, confidence, contrasting, customer, emotions, encouragement, excellence, expectations, face, feedback, feel, feeling, friendliness, good, great, happiness, happy, hopeful, improve, inspiration, inspire, joy, kind, mental, mood, motivation, motivational, one, ones, optimism, optimist, others, outstanding, positive, promotion, review, satisfied, service, smile, stand out, success, upset, valuation,