Weather can be unpredictable, I mean we are in Ohio. This makes getting that perfect blue sky for exteriors every time just not possible. "What about photoshopping a blue sky in?" great question but I have some thoughts on this.
So the image above is great example of the weather cooperating. The sun is hitting the front of the house lighting it beautifully. Blue sky with nice clouds.
Now for this home we have an overcast day. The lighting is flat, not necessarily bad, the home still looks great. Gray skies are a bummer but that was the weather that day. So can we take the blue sky from the first home and replace the sky above? The answer is yes but there are downfalls to doing this.
Ok, so here is the second home with the sky from the first. Does it seem a little weird? The lighting is completely different on those days. The home would be lit much brighter if was that clear of a sky. Also you may notice that the tree line has been removed. This was done because it is very difficult to make the tree line and the sky look real. In my opinion this is kinda of deceitful to the clients. When the go to see this home they will notice that now there is a tree line behind the home. People are much more aware of the photo manipulation these days.
Lets both keep the fingers crossed for those blue skies and fluffy clouds on the day the home is scheduled. If not your still receiving a great looking image of the home that will grab the buyers attention.