Definitions

I don't know about you but my art tutors keep telling us we can't use the words pretty, beautiful and ugly, because they are subjective and there meaning depends on each individual person. But I say stuff that use them.

Collins Pocket English Dictionary: New Edition

Art 

• Creation of works of beauty, esp. paintings or sculpture.
• Works of art collectively.
• Skill
• Nonscientific branches of knowledge.

Artist

• Person who produces works of art, esp. painting or sculpture.
• Person skilled at something.

Beautiful

• Possessing beauty.
• Very Pleasant.

Beauty

• Combination of all the qualities of a person or thing that delight the senses and mind.
• Very attractive Woman.
• Informal something outstanding of its kind.

Pretty

• Pleasing to look at.

Ugly

• Of unpleasant apperance.