The first two are difficult for me to read, for some reason the differing levels on the third one make it clearer IMO.
I understand the reasoning, but thumbs down on the green one. It's difficult to read and by using it on the K like that, the leaf is overstated.
Besides not being a fan of pink, the detail coming off the G on the second one is too busy and will not translate well to small prints. The idea behind making the K pink so it would stand out is not bad, but it makes me think there must be something special about that letter and I'm assuming that's not the case. As others have said, I would also associate that with more of a pre-teen market.
I like the slant put on the third one. If you really like the leaf association, maybe shadow one off the bottom of a letter? Nothing large or dramatic, just enough to add some interest to the letters, and it could be done so that you could have it in all black or do it in a color depending on what you were printing. Simple is best but I'm not sure I'm sold on the font used, I think it would seem to get lost when used in a small version, I love the odd alignment, but to me the font itself doesn't stand out much.
Do not like that the Y just hangs out there by itself, though. I think that needs to be attached to the rest. Here's a wild idea, make the Y higher so your name is shaped like a smile.