Is my forehead disproportionate to my face? (photo)

If you have a receding hair line, then eventually you may not like the proportions of your face.  At this time (with present photo) it is your judgement call on if you feel your face is disproportionate.  Beauty is in the eye of the beholder.

Some people have more prominent foreheads than others.  This is simply a genetic variation.  In your case, this is completely normal.  You have no supplied enough information nor enough photos to make any recommendations with regard to possible corrections.  For example, some people can frame the face better by adding hair to the temple region.  I cannot evaluate your temple points in these photos.  Others can lower the hairline by grafting or hair line advancement surgery.  However, all of these options are dependent on your age, family history of hair loss, future potential for hair loss, your donor hair capacity, and existing hair loss.  Sometimes, it is a bad idea to do anything.  The easiest solution is to keep you hair forward.  There is nothing abnormal about your appearance.  Beauty is always in the eye of the beholder.  You look great.  

To find out where your hairline belongs, lift your eyebrows and look to the highest crease in your furrowed brow. Your center hairline should be about a finger breath from the highest crease