Are you familiar with "The Official Redbook: A Guide Book of United States Coins"? I highly recommend you get one if you don't! That book is a VERY helpful resource. The 1920 Buffalo nickel is a very common date. It is probably worth between $0.50 to $1.00. The date is clear, but that horn is worn smooth.
Try to get your photo to come out full size. Move back from the coin, then crop the image. We say this because on higher dollar coins there coud be rim damage or some other type of damage that would lower the grade. Showing the area where a MM would be could also change the value. Remember full size cropped photos.
The 1920 D nickel is a better date. Look up recently sold listings on eBay for a rough value. That is what I do anyhow if I want to know what my coin is roughly worth.
Scopes are great for close ups but not for grading Photos they multiply any defect on the coins surface Try a soup can a light and your cell phone. I believe @SensibleSal66 has a good photo of the set up.