You have done very well here, excellent focus.
I use a SONY Alpha 55 with a dedicated SONY2.8-100 macro lens, to acquire similar shots, during the past year or two I have come up with a winning formulae for most of my macro shots ( see my portfolio of examples)
My DIY Snoot flash reflector/diffuser consists of a Pound Shop plastic cereal box with the bottom cut with a door- like opening to fit tightly over my Speedlight.
The top inside of the container is lined with kitchen foil, just inside the front end inside the top, I have glued a small plastic mirror that increases the light to where it is needed. The lid of the box can be on or off depending upon the diffusion required, I leave it off now and use white paper towel as a diffuser if taking something shiny.
I have learned that despite quite a bit if advice to the contrary, I can successfully use AUTO FOCUS.....it is extremely fast and efficient on the Sony kit, there can be a little bit of hunting by the lens, but not much different to rocking back and forth yourself whith camera set to Manual.
My standard settings which seem to work every time with this set up are......depending upon ambient light..
Aperture 9 to 16 Shutter 160th ISO Between 200-400. Flash to highest level for a start.
Macro is a deep and fascinating photographic challenge......enjoy?