Yes, eyes are indeed poseable and lots of people don't even know it!

During prayer, the eyes are usually pointing upward. Select the left eye and adjust the Up-Down setting to a negative value to move the eye upward. The side-side setting can be adjusted a tad as well if you want the eyes to look slightly sideward.

Then, apply the same settings to the right eye. Adjust a bit if necessary if the eyes look cross-eyed (sometimes they do just a tad).