What vibrant color! It really has an artistic flavor, the combined colors of purple and green, and the way it’s composed.
I would have re-positioned myself to exclude the sidewalk in the top left corner. Also, if possible, it would be nice if the background was more blurry. You’re using a great aperture for this, but you should be able to increase the blur by stepping back and zooming in to get the same composition.
Also, in the future, to bypass the upload error, just upload pictures that are less than 2MB in size. Let us know if the article @buddingphotographer mentioned helps solve the problem!