My sheets -- what more can be said?

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That aren't actual veins of the leaf. It's a branch stuck onto the leaf to stabilize it.

So then...
For one, the palette lacks of contrast towards the darkler tones whereas the lighter tones are way too bright - as i stated, it's a leaf, not a gemstone, it shouldn't reflect that much light.
As Fierce_Muffin said, the 'stem' should be the same as the branches.
Number two lacks the outstanding branches while they look like weird hairs on the third. Number for, somehow, doesn't give the look of a leaf at all and looks pretty crippled.

Anyways, that's what I came up with.

I wasn't too happy with the first one and started a second attempt, aiming for a drastically simplified branch, as that seems to be the main problem. Probably you should do something like that...