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The OP does not want to "improve" the images that she posted. She wants the opposite: she wants to take a "good" photo and make it look like the examples she posted.I think you can take some changes there in these poor photographs. Actually I'm not clear what you said. If you need brightness, saturation, contrast then possible but, why you said " because I am sure those are not original pictures"?
Do you need any retouch there?
The OP does not want to "improve" the images that she posted. She wants the opposite: she wants to take a "good" photo and make it look like the examples she posted.
Tom M