Did the presentation of gruesome photographs to each grand juror violate the Fifth and Fourteenth Amendments?

QUESTION(S) PRESENTED I. A federal ex-prisoner, has the right to present a "fundamental error" byway of a writ of coram nobis, involving newly discovered evidence, pursuing with diligence; a prosecutor, who, presenting gruesome photographs to each grand juror against the dangers of unfair prejudice. Did the presentation thereby violates the Fifth and Fourteenth Amendment(s)? I. Under the Fifth and Sixth Amendent(s), did an ex-federal prisoner, have the right to challenge an issue involving newly discovered evidence, pursuing with diligence; a preserved Fatal Variance claim that trial counsel fails to proceed under a direct review, when the federal sentence is completed? i