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Are there specific images that are called for on the iconostasis, or is it based upon the patron of the specific Church
Yes, the iconostas in Ukrainian and Russian churches and somewhat different in Greek has a particular form. Ukrainian churches often have multiple level ikonostas*
This classic iconostasis consist of five levels or rows: Ancestors of Christ, Prophets, Holiday, Deisus level and Local level.
The most superior level is Ancester level above this often is a Cross. This level symbolizes the Old Testament ancestors of Christ and are including from Adam and ending with Iakov. In center may be old testament Trinity (like Rublev ikon). Depending on size church may be Adam, Avel, Sif, Ynos, Kain, Avraam, Isaak and Iakov.
After ancestral is prophetic level in which are placed 30 prophets if possible: moisei, Tsar David, GTsar Solomon, Elisei, Daniil, Zakharia, Azarij, Anin. *In center is often the Znamenije of Mother of God which is prefiguring birth of Jesus Christ.
The Holy Day or Festival level is dedicated to the basic holidays of New Testament beginning with the annunciation. Then is coming Birth of Christ, Encounter of Lord, Baptism in Jordan, Transfiguration, Arising of Lazarus, entrance into Jerusalem, Crucifixion, Taking from Cross, Placing in tomb, Paskha, Ascending of Christ, Desending of Holy Spirit and the Assuming of mother of God Falling asleep.
Next is Deisus level: two meanings: prayer to Christ and his glorification as the Allpowerful. In this level is found at center Christ on throne, to the left his prayerful Mother of God, to the Right, Ioann the Previous Coming, also prayihng. Then are other apostls: Petr, Pavel, Ioann Theologian, Matfei Evangelist, Luka Evangelist.
The lowest level and at times only level of small church is local level. In the center are the Tsar gates or Heavenly gates. On gates are usually Annunciation and images of four Evangelists. On left from Doors is located icon of Mother of God and on right the ikon of Jesus Christ. Beyond are icons relating to the particular temple. Usually candles can be lit in front of these ikons. in special holders in front of these ikoni.
http://www.philos.msu.ru/vestnik/philos/art/1997/yakovlev_icon.files/image002.jpg
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