Well here you will be taught how to blend 2 images smoothly together.
1. Get 2 pictures that you want to blend together. These are the 2 i used:
2. Next put each picure on its own layer puting the picture u want blending on the top. Then using the rectangle marguee tool on the top layer, make a rectangle selection of what u want blended. Here is whati choose.
3. Now go to SELECTION>FEATHER. A box will pop up. this will determine come much the pictures will blend together. I choose 30 for mine.
4. Now make sure the rectangle that u made in the beginning is still there. And hit Clrl + C (copy). This will copy the top image. now click Clrl + V (paste) this will paste the top picture into the feathered rectangle.
EXTRA
You can also get similar results using the Eraser Tool and using a very large brush size. just make sure the pic you want to blend into the background is on top.













More Photoshop: