Here are few ways to improve your personality.
1. Dressing Sense
Your clothes need not be costly but they should be clean, well pressed, and according to your personality & occasion.
2. Body Fitness
Do exercise regularly to look active and energetic. A simple brisk walk of 30 minutes a day is sufficient.
3. Hair Style
Your hair should be well-trimmed according to your face cut and properly shampooed & groomed
4. Body Language
It should convey positive vibes for others
5. Expression
Learn to take control of your facial expressions
6. Right Posture
Sit straight and walk straight
7. Communication Skills
Develop soft speaking skills. Choose right words and speak clearly in a tone that is neither too loud nor too low. Don't murmur. Always give a warm handshake.
Note that it is equally important to have good presentation skills, high self-esteem, and confidence along with physical being and formal education to succeed in every sphere of life.
( Source: Griha Shobha, July (I), 2009 )
