Artistic vector image creation

I have a logo - as attached. I need to create a vector file, so it can be enlarged for a billboard. I also need the image tidying up artistically, i.e. leaves smoothing out, roots smoothing and appearing more realistic, so that it looks professional for people getting up close to the logo. It basically needs tidying up, where some parts were rushed, in a smooth style, and then saving out as a vector, so someone artistic who can use illustrator would be best. I have a basic version of the file already in illustrator - so can supply this. The lines are not great and it is not a good artistic attempt however, and the alignment isn't perfect. I will need a white background with the text grey and logo greyscale too. Do not bid for the project, if you cannot make the logo look artistically effective. It needs someone with judgement and style - not just someone who can create 2D vector icons. You will need a background in high end illustration. The gradients need to be accurately re-created and all the alignment retained. It must look just like the jpg - so copy that for alignment, drop shadows, gradients etc, not the .ai I will supply, and improve.