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Hi [USER=142455]@gatw18[/USER]

Again I am not the expert on this subject yet will provide my answer on how to place a subject into a composition of have it look more realistic from where to put the horizon line through the subject and also the sizing of the subject.

You suggested approach will work in quite a few situations yet certainly not all.  Here is where it will work.

a) When the camera shot of the composite was taken parallel to the ground i.e. pointing at the true horizon

b) When the camera shot of the subject was taken parallel to the ground and at the same approximate height above the ground of the subject as the subjects eyes.

Both of the above are not an uncommon situation and your approach will work in those case yet only when those conditions are met.  It will just look off otherwise.

As far as size of the subject there are a couple approaches

a) The subject can be sized relative to other objects at the same distance from the camera base on the relative size of the subject to those objects.

b) There are not always other objects at the same distance.  In those cases you use the perspective lines which show you how much the subject should grow or shrink in the image along the perspective lines to a known size object closer or further away or likewise using the perspective lines to resize an object larger or smaller (closer or futher away) to match the location of the subject for the relative comparison.    There are more complex cases yet will leave it at this point for your consideration

Hope this helps

John Wheeler