there are a lot of ways to blend. right now, i'll teach you one way that i do it with gradients and layer masks
first, open up a 500x200 document. paste the 3 pictures you want to blend on them. make sure they overlap. right now it should look like this:
now, select the top layer and click the layer mask button on the layers window
now, select the gradient tool and set it to these settings:
now, drag the gradient from the right side of the canvas to the middle:
now it should look like this:
change the colors to this now:

now, this time drag the gradient from the right side of the canvas to around the middle again (but with white>black rather than black>white)
it should look like this:
now, repeat these steps with the next layer (not the last)
by now, it should look something like this:
now, you may use the feather tool, the eraser tool, the blur tool, or anything else
now, you add textures and effects to make it look nice and improve the image quality.
Tutorial Copyright helen! @ Blogring.