i have done that but the sky is always gray

i managed to add pictures, this picture i am posting has the view i want but not the sky:

https://www.dropbox.com/home/sweet%20home/1920?preview=outside+1.png

this one has the sky i want but not the picture, i want the realistic picture from best quality:

https://www.dropbox.com/home/sweet ...

Hello how is everyone doing?
i am having trouble on my sky when i render the photo in fast quality i see the bright blue sky and when i render it in best(which i prefer) the sky is grayish sad looking, is there a way i can add the bright blue sky into the best render?? i am trying to post a picture ...