Breast Reduction - breasts are very far apart? (Photos)

Congratulations on having undergone breast reduction procedure.  As you likely know, at an intellectual level, it is much too early to evaluate the outcome of the procedure performed. You may find, for example, as swelling dissipates around the breasts, that the shape of the breasts will be more appealing.  Again, for example, as this occurs, there may be "deeper cleavage" and better overall breast definition. In other words, time and patience may be your best friends here. Best wishes for an outcome that you will be very pleased with.

I’m sorry to hear you’re having concerns about the results of your breast reduction, however, you should bear in mind that 3 days post-op is still very early. After a breast reduction, there will be some swelling due to the trauma your body has been through, meaning that your breasts will not look as expected. At this stage, you should be wearing any garments or dressings provided by your plastic surgeon, as they can help support your body to heal. It can take several weeks for swelling to settle down. Should you feel too worried to wait for your follow-up appointment, contact your plastic surgeon for advice.

You are still very early postop and I would not be concerned at present. It will take time for the breasts to settle and the final shape will take at least 3-6 months until you can make any true comment on the result. The way your breasts settle will be dictated by how you were preop and it is important in evaluating results longer term to look at the preop photos also. Stick with your PS I am sure it will all settle appropriately. 

First off, although the best way to evaluate preop / postop results is not to use a cell phone camera, from what I can tell you appear to have an excellent result.  We won't know for sure, of course, until 1) the dressings come off, and 2) you have given it enough time for postoperative swelling to subside, scars to mature, etc.
To really answer your question, it is important to look at the position of your nipple-areolar complex (i.e., "NAC") pre-operatively. Breasts are all unique. Some women are born with NAC's that are wide apart, and some are closer together. 
In general, when we perform a breast reduction or lift, we re-position the NAC along a line that goes from the middle-third or middle of the clavicle, down to the current location of the NAC. If for some reason that position doesn't look right (for example, because the breasts are unusually large, ptotic, or "deflated" after massive weight loss or pregnancy), we will sometimes use our best judgement and move the NAC medially or laterally a bit.  But, in general, the new nipple position is dictated by a combination of 1) the old nipple position, and 2) the bony anatomy of your chest wall.
All that being said, you look great!