Shot with a Sony a6700 and Tamron 28-75mm G2 in a Nauticam housing with a single Inon D200 strobe. I may have had a SubSea +5 diopter on, but I don't remember at what point I took it on/off during my shooting. All three photos were shot at the same 69mm, f/16, 1/160sec, ISO 200.

Any constructive feedback about any would be appreciated.

On this shot I can't get the lighting balanced quite right, it feels too bright/white overall to me, but especially around the edges. I tried playing with the Vignette in Lightroom (see the second version), but I'm not super happy with that one either. Any thoughts folks might have there would be appreciated as well.

Nice work!

A couple of thoughts. It’s one of those images where it’s hard to separate the subject from a similar coloured and complex background. For me, the key then is to try and create separation and an element of neutral space so that the subject can stand out more. This is especially true with the distinctive shape of a seahorse.

I’d suggest shooting up, trying to position to shoot against the blue, a wider aperture to create less depth of field, and/or using a snoot. These are counsels of perfection of course (!) and none maybe easy. I know the location and it may well not have been possible but this is what I’d have been tempted to try.