It is a good essay. Because it is a strong essay, my critique will be more nitpicky--delving into nuance and substance. I feel that a few little tweaks would make it a lot stronger.
Here are a few things that tripped up my thought process as a reader:
It was fresh, clean, and free of pollution unlike the air in busy US cities.
Fresh, clean, and free of pollution feels a little redundant here. Given the short nature of this essay, I'd like to see you use your words more powerfully. Take out either the
clean or the
free of pollution to get to your point without being verbose.
a 9 hour flight
Spell out the word
nine.
I couldn't help but grin as I took in a deep breath of the cool, Italian air. It was fresh, clean, and free of pollution unlike the air in busy US cities. The landscape was remarkable; rolling hills of green, accented with colorful vineyards and seas of luminous daffodils.
This is as you were stepping off of the airplane ... into the terminal? Onto the tarmac? I would imagine that the air in the terminal would be stale and recirculated while the air on a tarmac would have the odor of jet fuel. I haven't been to an Tuscan airport, but I am also having a hard time imagining that there are vineyards and fields of daffodils surrounding the airport. The shift from an airport and (I assume arduous) nine-hour flight to the dreamy country landscape is too abrupt.
to the minuscule, intricate detail inside the Sistine Chapel
Again, a little verbose and repetitive.
Minuscule and
intricate are too closely related. You could substitute another adjective to describe the detail, but saying that it is both minuscule and intricate doesn't add anything to the mental image.
Going on a study abroad trip to Italy was a dream come true for me. Art had always been an interest of mine
This isn't bad, but it isn't as descriptive as it could be.
Why did you want to go to Italy? To see the art? To study abroad? As written, it sounds a little generic.
I grasped the notion with open arms.
Notion isn't the best word here. It isn't merely synonymous with
idea, but conveys that the idea is vague or ill-formed.
I was afraid the teachers on the trip were going to be overbearing and conservative, but I was mistaken.
Conservative might not be the best word here either. As a reader, I had a mental picture of the teachers being
libertine--my first thought as an opposite of conservative.
Conservative has so many possible meanings that it loses its meaning here. The reader doesn't really know
what you were afraid your teachers would be.
populous amounts of homework
Yeah,
populous isn't right here. How about prodigious or inordinate?
Immeasurable doesn't really work either because it
is measurable and the word lacks life. Like Simone said, play with the thesaurus here to get just the right word.
Ack! Out of time. I must head off to class. I'll let others pick up the rest of the essay.