Hello, Antônio. I would say something similar to what others have (very well) mentioned above but, after your edits, the images look a lot better, IMO! I liked all of them. To me, the only thing that does not work well is the messy background on #2, but small sensors will give you a significantly larger DoF, making the "Bokeh" a difficult task, sometimes.
Summary: Great job with a superzoom camera, showing us a very nice environment! Keep shooting and sharing!
PS.: The cactus on #2 is a Melocactus Zehentneri, popularly known here as "monk´s head" (
http://www.cactus-art.biz/schede/MEL...zehentneri.htm)
Cheers...