There are 4 different eggs - which one do you think is clear? If it is clear, what is the shadow parts at the top of the eggs? It doesn't really move if I turn the eggs a different direction. If they are clear, what should I do? Do I take them away from Mama?
In my very limited experience (2 broody hatches under my belt) Momma hen will decide when enough is enough and abandon the unhatched eggs - in my case she gave them approx 24 hours after the last of the hatchers arrived. 1st time she was very reluctant and kept going back to the unhatched egg 2nd time she made the decision and moved the live chicks to a different nest without looking back.
I do not candle my eggs - so again not very experienced - but from photos seen on this forum, to me the top one looks like a partially formed chick and the others non starters.