Blending/Transparent questions

'lo ya'll

I took two pictures of my engine. One with the hood up, one with it down, in the same position. What I want to do is do a selection of just the engine, copy it over to the closed hood picture, then be able to "see" the engine inside. I've already done the selections and copying, now I don't know how to get the edges of the copy to blur with the edges of the car. To make it look like you're seeing a cutout of the hood to see the engine, any help would be appreciated. Thanks.

maybe try to feather the selection after you've selected the engine... then paste it. And then maybe try to use some of the different blending modes in Photoshop... change the opacity.. use the ereaser tool (with different opacities) or add a layermask..

if you want it to look like to made a hoel in the hood you need a little depth in there too.. the hood itsef of course isnt thin as paper and you have to remember the unless the angle it shot from straight above the car..

some shadow too i would guess :P hard to say, since i cant see the photos though