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We can use CSS to rotate your images, however, I strongly suggest that you edit your pictures using a photo editor and rotate it to the appropriate display.
Here are some links that you can check:
If you are using Mac OS X, you can check this link: http://www.howtogeek.com/201638/use-your-macs-preview-app-to-crop-resize-rotate-and-edit-images/
If you are using Windows OS, you can check this one: http://windows.microsoft.com/en-ph/windows7/rotate-a-picture-using-windows-photo-viewer
After that, re-upload your images in the form builder, they should now be positioned correctly.
Let us know if that works.