Apply RotateTransform to the image with its original Angle set to 0. Then animate the Angle transform property in the normal way.
If you specifically want a discrete rotation, where the rotation is noticeably clicked on jumps of one degree, use DoubleAnimationUsingKeyFrames instead of the usual DoubleAnimation and create each keyframe DiscreteDoubleKeyFrame. (You probably want to create a program script in this case because you will have many key frames.)
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