Symbols

The Circle is the most common and universal signs, found in all cultures. It is the symbol of the sun in its limitless or boundless aspect. It has no beginning or end, and no divisions, making it the perfect symbol of completeness, eternity, and the soul:

The circle is also the symbol of boundary and enclosure, of completion, and returning cycles.

Completeness: I am an adult person- complete person and all my skills represent the completeness of all the things I used to do in past and which formed my personality.

http://symboldictionary.net/?p=1914

Circle also represents:

• Life (graphical (display) , fast, nature loving, balanced, global, steady, stable, emotional)
• Motion (patient, hard working, fast, diversified, musical, sportive, artistic)
• Female (emotional, craft loving, caring, visual, experimental, nature loving)
• Beginning (communicative, experimental)
• Potential (musical, artistic, engineering, creative, graphical, innovative, fast, presentable)
• Cosmos (nature loving, analysing-(yoga, pilates, psycology, philosophy)

http://www.whats-your-sign.com/simple-symbol-meaning.html

All these characteristics + the meaning of the green colour together make a good representation of my skills.