This is very beautiful. The grass is very nicely done I really like how it is mostly selected as a brighter color green. The piranha plant and the pipe are nicely done and the detail with the vines wrapping around it looks very well done. The colors for the piranha plant have been selected ever so nicely I really like the red you've chosen for that and the blocks look so much more simplistic and real looking which really is a big element to the point of this artwork. The background could use a little more detail like some Mario clouds or something though.