My Peace Dollars - New Collector

hello all!
My wife and I are VERY new to this hobby (as in a few weeks, lol) and we're very much enjoying it. I've been doing lots of reading & I'm now starting to try my hand at grading the coins I have received from my father-in-law who passed away. These are some of the first few I'm enjoying, after I dealt with a couple of Indian head pennies and early 1915-1920-ish Lincolns. I was hoping to get your thoughts. These are the four I possess. I'm guessing the grades as follows:

1922 - VF-30?
1923 - MS-60?
1924 - EF-45?
1927 - EF-40?

Thanks everyone. Hope this is OK. (still experimenting on best way to get pictures that capture detail as well as do justice to the true coloring). Gonna have a lot of questions, especially about grading, which seems to be more of an art than a factual science. Ugh. But fun.

I am most confused about the shiny/frosty one, almost whitish in appearance. A friend gave this to me as a gift, sealed in that little plastic thing from a collection known as "Twentieth Century Coins." It is SO MUCH brighter than the other circulated ones I inherited, and yet in some spots (e.g., the lettering around edges Liberty, United States, etc) and on the Eagle and the obverse hair is not nearly as detailed as I assumed it would be. Thoughts?

THANKS!