Do you have any advice on how to keep my head up while I ride? I usually keep it up, but sometimes it drifts and I end up looking at my horse legs or my feet.

try to "feel" what is going on with the horse not look. and yeah concentrate on what is in front of you
Be sure to always look at where you are going, Plan where you are going with your eyes as well. it will take some getting used to.
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