PHP Merge 2 Images Insert Face To An Image

Question

I have 2 images. one face image and one frame image and I want to insert the face image into the frame image.

So I tried this code:

<?php
$image = imagecreatefromjpeg('face.jpg');
$frame = imagecreatefrompng('ironman.png');

$iw = imagesx($image);
$ih = imagesy($image);

$fw = imagesx($frame);
$fh = imagesy($frame);

imagealphablending($frame, true);
imagesavealpha($frame, true);
imagecopy($image, $frame, 0, 0, 0, 0, $fw, $fh);

header('Content-Type: image/jpeg');
imagejpeg($image);

imagedestroy($image);
imagedestroy($frame);
?>

The problem is that the resolution of the output image is not that of the frame image. And I wanted to change the position of the face image. How can I do these things?