Very nice for the rather low cost approach! Cudos.
For those wondering, why anybody wants to shell out more cash for a real macro lens, have a look at the bumble bee (5th image) in Photobucket, and get the fully enlarged shot. Then look at the red petals that are slightly out of focus to the rear, notice that the side towards the center has a blue edge. That is chromatic aberration. You can also see color halos on the snow flakes. Some of the snow flakes do not look in focus to me.
Other differences for true macro lenses are field flatness, and rectilinear reproduction, i.e., no curving lines along the edge of the frame. In the above images it does not matter too much, but in reproduction photography, that is critical.
On the stingless be image the background blur (aka Bokeh) is quite angular, which is caused by a low number of aperture blades. Better lenses have more blades, making those halos rounder.
But again, given the simple means, those are some nice shots.
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