Possible Clues:

• Intricate detail not a feature of Cervantes' writing?
• A marked characteristic of the Spanish Señor
• Foreign accent?
• S‹o Paulo has one
• Accent over a letter
• Crossing line, movement of sea is a sign to the Spanish
• Accent used in Spanish and Portuguese
• Señorita's curve?
• Wavy line in Spanish lake, amid change in water level
• Senor should have one