First you need to choose the best-looking picture from your gallery. After you find the best, most colorful you enter Photoshop and open the image find Crop Tool enter Weight and Height (ex: 88 88 ) of thumb and make a selection.

 

 


Here you can see I've made a selection and I'm ready to Crop it :)
You can use Sharp to make a clear thumb
and finally you're ready to save. I'll go for JPEG High compression 60 or 75 :)
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