For the eye, I personally would go ahead and do more slightly more editing -- particularly lightening the visible vasculature in the white of the eye. I like it generally, though -- good composition and balance, well directed.
The taxi scene doesn't do anything for me, honestly. There's nothing really interesting about
that taxi or the flowers; two seemingly unrelated things selectively colored is too busy. The thing that seems to pop out more than anything else as an element of interest is the sewer access cover in the lower left. But I don't think the composition overall is well suited to selective coloring....
Cheers, keep at it.