Very lovely photo. I really like how you've done it all in whites and light tones. Has a very touching feel to it. I agree with the cc, I think putting a light gaussian blur, for a soft focus look might be a nice touch for an alternate version. Very nice shot thought, very nice indeed.
Focus is very good. Depth of field could have been used to soften the background. As it is the swag of cloth trys to lead the eye out of the picture, and the partial architectural element does not really seem to have a purpose. Either or both, elements could be out of the picture with no harm done. The whites of his shirt are blown out in the highlights, but it actually comes across as luminous, so it does work for me.
The skin tones work well for pastels, so it meets the challenge.
If anything, the sharp darkness of the hair against the pastel skin, is the point I would notice most. I would really like to see this picture done soft focus, for a dreamy - fantasy type of presentation.
Very well done, and I'm sure this couple will treasure this picture till the end of time.
A very nice idea. The only thing I might change is to remove the fabric from the left of the mother. I find that it pulls me out of the left of the photo. Perhaps something that frames the mother and father and continually brings your eye back to them.