Hi Alicia,
My wife has a hard time with eyes too some times. One of the tricks we've learned to help us correct a problem is to use Photoshop as a tool to compare your painting to your original photo.
Now, the trick to this is that you need a photo of your painting and usually artists don't get the photos taken until they're finished. So, a digital camera for this would work best.
Take your original photo and your painting photo and scan both images into your computer. then, using Photoshop, place your painting photo over your original photo. Then, decrease the opacity of your painting layer. This will give you a tracing paper effect. It will allow you to compare the accuracy of your drawing to the actual photograph. It will really show you exactly where your technical errors are.
John
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