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Feet are necessarily present with barefoot but I still think this implication is not needed as you can find precisely what you want using a search. Soles and toes are dependent upon perspective. If you just see the tops of the feet for instance than soles necessarily are not visible. Toes should be of sufficient quality to be tagged to begin with and are also dependent on visibility perspective as in post #2421890.
Barefoot, soles not visible post #2421026
More on the feet implication request: There are posts tagged with barefoot where feet are not present and this seems to just be poor tagging. Moreover I don't think a tag implication is in order as you can just run a search to find what you want, as it would just cause superfluous server load. Is ~barefoot ~feet not sufficient?
Toes and soles to me should not be tagged unless they are drawn nicely and anatomically. Many toes as you surely know do not meet this bar and look like a hideous abortive mess or the result of binding. This is more of a tag gardening project than a needed implication.