u/Artistic-Theme-7948

So I’ve been trying to place a human eye into a SpongeBob image and make it look like it actually belongs there. I know this should be a simple edit, but I can’t get the blending to look realistic at all.

I’ve tried looking up tutorials on YouTube, but I either can’t find the right kind of walkthrough or I’m just not searching the right terms.

Any tips on how to realistically blend an object or subject into another image in Photoshop without using Auto Blend would be really appreciated.

TL;DR: How do you realistically blend elements from one image into another in Photoshop without relying on Auto Blend? (i tried to blend human eyes on to the spongebob image)