Nice work Ruben. I like the patterns formed. The noise is not an issue here. I would have tried recomposing a bit to include the fronds on the edges of the image fully. (Either to the right or the left). Did you use a tripod? If you did you could have tried some longer exposures with narrower apertures for even greater depth of field as the DOF is pretty shallow at short focal lengths.
I'm curious to know if you also tried keeping the point of focus at one end of the pattern such that the focus gradually fades off either from left or from the right as opposed to the focus at the centre. Just a thought !!!
Thanks for sharing. A nice effort.