Daniel - Great froggy shots! The shot with eggs is a stunner to me - that's been on my wishlist for YEARS now. Great find, and excellently captured.
I am afraid I disagree with Keri here. What a wasted opportunity the green frogfish is. Such great subject matter and the chance was missed by playing around with a snoot and half cutting off the mouth. I am only so honest (because since you knew when the eggs hatched) I am sure you have lots of photos of this fish and its eggs.
The key to good lighting is not just to learn a fancy technique and apply it to the next subject you find. But is to choose the technique to match the what you as a photographer want to "say" about the subject - the concept of your image. Subject, camera angle, composition, depth of field, lighting, all working in synergy with the important message of that image. To quote mister adams "there is nothing worse than a sharp image of a fuzzy concept" or something like that.
Your two images are a great example of this. The concept behind the lower image is a portrait. Directional light is well suited to a portrait, particularly with a frogfish, accentuating their texture and creating mood. This image the lighting works in synergy with the concept. The other shot is about a behaviour and here the most important part of the concept is what is going on. And here I want to see all that in the frame, not squeezed in at either end. And with lighting that shows it off best. I would expect that your non-snoot images of this frogfish with eggs are much stronger images.