Answer:
<em>The shoes look very expensive and elegant, but I can not tell if the diamonds are real.</em>
Explanation:
A compound sentence is a sentence containing two independent clauses or more that have related ideas, and that may be joined by a semicolon or coordinating conjunction like <em>and, but, so, for, nor, or, yet</em>. An independent clause is a group of words with a subject and a verb that expresses a complete thought.
An example of a compound sentence describing the picture is the following: <em>The shoes look very expensive and elegant, but I can not tell if the diamonds are real</em>.
(<em>The shoes look very expensive and elegant </em>is one independent clause and <em>I can not tell if the diamonds are real </em>is another one).