IMPORTANT NOTE:
If your tree is public, before adding any photos or documents to your tree, bear in mind that it may well be copied without your permission and posted on someone else's tree.
First of all - find your photo.
You need to get to know where your photos are stored so you can easily find them again. (below)
Open up your Ancestry tree, and open the profile of the person you want to add a picture to. (below)
Open up the Profile.
Go to heading Gallery.
Click Add. (below)
Hit Upload Photos.
Then Choose files. (below)
Hopefully you can remember where you saved your photo.
Select the photo and then press Open. (below)
And you're Done. (below)

It's also great to have a photo on an individual's profile on your tree; on Ancestry, click on your person's face... (below)
Hopefully by now you should already have a gallery of images on Ancestry for this person; so pick your best facial image. (below)
Also you can crop the image, so you may wish to just get a close-up of the person's face - this is what will show on your Ancestry tree view.
In this case I would use 'use full image'. (below)
You can also use exactly the same process with other pictures on a profile - which make it easier to see how your tree connects to other DNA matches using personalised logos... (below)
Or perhaps the line dies out because he or she had no further children or died as a child... (below)
HOT TIP:
Whenever you are in a person's profile on Ancestry, you can return to the main tree by clicking the wee tree symbol. (below)
And the finished product on Ancestry...











































