More details will be welcome. Also you could have in focus those water droplets , by having bigger f stops , f20 let's say. You said you been using diffuser, then in my opinion you should achieve much more better image and quality in this picture.
Also for me is a bit to dark, and I can spot some noise here as well.
If you want, one of our Staff Team or Forum Mentor could help you with this image here:
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