Theory:

The little man’s face wrinkled like a dishcloth thrown in the hamper. He kicked his legs and doubled his fists and he grimaced and scowled and  pursed his lips, “Oh, am I cursed! But
I’ll do it.”
Explanation:

After hearing this, the little man’s face creased look of cloth used for washing dishes. He revealed his dissatisfaction for the work by kicking legs, doubling his fists and making dull faces. He asked if he was that hapless to do that burden. But he guaranteed to do the work.
 
Meanings of difficult words:
  
Numbers
Word
Meaning
 1.
Dishcloth
A cloth used for washing dishes.
2.
Hamper
A basket with a lid.
3.
Grimaced, scowled, pursed his lips
His face had these expressions, showing disgust, anger and disapproval.
4.
Wrinkled
Slight folds on skin because of old age.
5.
Cursed
Ill-fated.
Reference:
National Council of Educational Research and Training (2006). Honeysuckle. Who did Patrick's Homework - Carol Moore (pp. 7-10). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.