"Easily pick photos to your favorite..." - My favorite WHAT? And do you mean 'save', rather than 'pick'?
"Excellent photo viewer..."? - Really? - There is no need to use 'Excellent" in normal English usage, as doing so implies that you would actually produce a viewer (in this case) that was not very good - and would actually admit that fact. Also, "with multiple formats support" would read better (grammatically) as either "supporting multiple formats" OR "with support for multiple formats". Plus, claiming that the viewer "is your excellent mate..." is meaningless to the majority of native English speakers.
When talking about the 'Slideshow viewer function', it would read better as "Photo+ includes several slideshow formats, which can all be set to music.
The ability to crop, rotate and zoom pictures may HELP the user to "view photos more conveniently", but does not MAKE them do so.
In the "Share photos..." paragraph, the friends would be ON "Flickr, Twitter and Facebook", NOT 'in' them.
