1. The sun is rising in the east.

1-1. The sun is coming up in the east.

2. The sun is setting in the west.
2-2. the sun is going down in the west.

3. Don't look at the sun with your eyes for a long time. You will become blind.

4. Don't look at the sun with your naked eyes. It will harm/hurt/ache your eyes. You can become blind.
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Are they all grammatical? Would you correct unnatural sentences?

1 answer

1 through 3 are fine.

If you use 'harm' in 4, that sentence will be correct, too.