You have done a superb job merging the two images, the merge areas are very credible. I especially appreciate delicate cut out around his right fingers. Composition is nicely balance.
I notice inconsistency in the lighting direction. The shadow behind his feet and face suggests a directional lighting from 2 o'clock and deeper behind the glass. The brightness pattern on the jelly suggests lighting from above and close to the glass, i.e., the nearer jelly is brighter than the farther ones. Perhap flipping the jelly fish direction horizontally?
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