It is paragraph #1 because the other paragraphs are not using imagery. You need to be able to see what they're saying in your mind, like a picture. "Red brick".."absolutely stunning"..."marble floor". Imagery appeals to five senses: hearing, touch, sight, smell, and taste.
First, <em>Mom </em>should be capitalized because it is a name.
<em>Southwest</em> because it is a place.
<em>America</em> because it is a Country.
And also <em>Texas</em> because it's a state.
Hope this helped :)