Its not every day that you see a post where every sentence includes a misunderstanding!

Perhaps you would be better researching the industry before starting to upload?

Alamy Rule: If they find a problem, everything in your submission queue is rejected. Yes, you could submit one at a time as a test. But, another fail is a black mark on your record and reduces your speed through inspection. Much better to submit perfect work and learn from an occasional oops that gets by your inspection.

I inspect all images at 200% Photoshop zoom. Then inspect again at 100%. All dust spots and hot pixels must be cleaned up. Very distant birds in the sky can sometimes be judged as dust specs so be ruthless in your cleanup.

Some sensor dust is a larger fuzzy area (at 100-200%). The best plan is a clean sensor. After the fact it may or may not be difficult to clean in the image. It all depends on where is the spot and what image detail is damaged.

Check your sensor dust by shooting a clear blue sky at f22 to f32. Inspect at 200%. You will see the various types of dust spots pretty easily if your sensor has not been cleaned recently. Note where these spots are and look back at recent pictures in the same areas to see how they appear over image material.