Hey Haewon!

Great question. I understand the confusion, but I think you are missing some foundational piece of knowledge about conjunctions.

Okay.

There are TWO types of conjunctions in the English language.

1. Coordinating conjunctions

- These are your FANBOYS.

- The function of coordinating conjunctions is to conjoin (join) two independent clauses (by adding a comma + FANBOYS).

2. Subordinating conjunctions

- ex. although, since, whereas, while, if, unless, because, as, when, before, after, whether, etc..

- Subordinating conjunctions can be used to form dependent clauses.

       ex. While I run, I listen to music.     ex. I listen to music while I run.

Also, there are conjunctive adverbs.

- ex. however, moreover, furthermore, instead, therefore, thus, nevertheless, etc...

- when a sentence uses a conjunctive adverb, the sentence is still an independent clause.

       ex.  I got an A in math; however, I failed chemistry.

- when you use a conjunctive adverb between two complete sentences, you must use a semicolon or period to separate the two sentences.

      ex. Jack fell on the ground. However, he was not injured. (correct)

      ex. Jack fell on the ground; however, he was not injured. (correct)

- you ONLY place commas around the conjunctive adverb if it is in the middle of ONE sentence.

      ex. Jack fell on the ground, however, he was not injured. (WRONG)

      ex. Jack, however, was not injured. (correct)

Thus, "whereas others present pictures" is a dependent clause, which makes the sentence grammatically correct.

note: Usually, when a dependent clause comes after the independent clause, you do NOT need a comma before the dependent clause.

       ex. I listen to music while I run.

       ex. I went to bed after I finished my homework.

The SAT won't test you on that...but it is nice to know. =)

Hope this helps!

Keep moving forward!

You got this!