iDad's right.... you'll need the transform tool if you want to send the person into the background... lol...
dr_sniper, you've heard of vanishing point in an image.... it's a set of imaginary lines that begins from the foreground and converge at an imaginary point in the distance..... it shows that an object gets smaller proportionally as it goes further back from the foreground of the image.
View attachment 3549
as my image show the red lines are the imaginary vanishing point... depending where you want to put the person, you have to use the transform tool to shrink the person down to the size proportionate to where you want him in the image. As you can see in the background, the giant gull is obviously out of place....
But it does not end there. This is the part Steve was saying when he mentioned about color, contrast and lighting.... depending on the image you have to adjust the color of the person's clothes, shadows, lighting depending on the time of day or whatever light source there is in the image as well as adjusting the brightness and contrast if it were a night scene ( the further he is away from a light source, the darker he is), as well as other adjustments to get the right look.
In my image, I had to blur the gull on the left . If you were to take a real picture, you would be adjusting your focus on the main subject , the gull in front. This will blur whatever objects or background in the image - the blur depending on your adjustment. The gull in the middle next to the giant is untouched... notice how fake it is..... notice how blurred the 2 birds in the far background are?
These are just principles that I hope can help you with your project..... you might need a little bit of imagination, too.... How will the person look like if he were that far away?.......