The Lamb itself represents Jesus Christ, without stain, who shed His blood to save the new Israel from sin and death. It is the main title used for Jesus Christ in Revelation and used 28 times.
Standing after being slain, indicates Jesus Christ rising from the dead, the Resurrection, after being crucified and dying on the cross.
Horns, represent Christ's fullness of power.
Eyes, represent all seeing, knowledge. Only Christ has all seeing knowledge.
No.7, in the OT, represented perfection and completeness.
Jesus Christ is the epitome of perfection, is all seeing and all knowledgeable, with the fullness of power to complete God's plan of salvation.