I can see 9 spots, there may be more.
It appears to me that you have dust on the sensor (or the glass covering the sensor). There are kits to clean it, and it isn't terribly difficult. If you're serious about photography, it would behoove you to learn how to clean and care for the sensor and techniques to change lenses to reduce the introduction of dust.
Otherwise nice photos, given the Hong Kong gray backdrop.
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