Whats the trick to exporting TIFs that will work with photomerge?

when works, photoshop photomerge amazing. that's if it works..  not seem smart @ actual pattern recognition.   see attached 4 photos want stitch left right. @ best merge middle 2 photos, tacking end-two below result in merge output.  don't understand more cropping exports, less photomerge works. if crop out trees example, fails merge anything!

 

these export weird merge result:

 

trouble is, more mess crops , angles, more message "some files not merged".   not understand this.  ideas?

 

thanks.

unless taken @ same moment, ripples , waves , other details of water change time , therefore 1 image next cannot used matching.  land , clouds in sky of none constant enough , maybe there isn't enough overlapping detail in land compared lack of in water photomerge find common points match on.

 

the first , second images overlap small amount , third , fourth images have small amount of land-detail in common.  middle 2 images overlap more , have boats match on. 

 

it have been better take more, vertical images, include foreground land area, horizon. 

 

i use pay-for panorama product called autopanogiga allows specify areas common between pairs of images , it'd able something.  i'm sure there other, similar tools, perhaps cheaper or free, 1 i've used several years , works well.   has free-trial mode watermarks result, can @ least see if it'd work:

http://www.kolor.com/image-stitching-software-autopano-giga.html

 

there cheaper pro version, prefer giga version because, among other things, allows masking out portions of images don't want in final results, such feet if i'm doing full-spherical panorama.

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