I'll simply start of with the title: It is really eye-catching especially since it is somewhat contrary because I'd connect "to baptize" with something positive yet sorrow is no where positive. This title is definately outstanding and that is what it needs to be to draw people to read.
Pale skin , sad eyes
tell a story of lost love
baptized in loneliness
^ I'd remove the space you put before the "," it looks weird. You set a really great image here, especially since you're saying that the look of someone tells a story, which doesn't seem to make sense when I read these words though it's obvious that there is something that ripped the persons heart out.
Leaves of green turn brown
and scatter to the wind
barren trees loom dark
^ I like your choice of words in this stanza because when leaves are green one knows that it's still alive and really beautiful. If they turn brown though they are dying or died already, which underlines you message perfectly.
"why did you leave?"
^ There are no more words necessary to show the speakers frustration and pain than by asking why he left.
she knows it's him
reborn into eternal bliss
^ I have to admit that I did not expect this end, which is actually good. I thought it would stay as saddening as it started, this gives hope though and it seems to be the perfect end.
Overall you penned a really powerful poem here. There is not really something I can complain about because it was great. I especially liked the detailed description and the structure.