Salaah

Q: What is your opinion on this:

http://homeshopping.pk/products/Digital-Prayer-Mat-in-Pakistan-.html

It shows the rakats prayed on near the place of the sajdah, so the one praying can see the number of rakats he has prayed. But according to hanafi fiqh reading and understanding such as from a piece of paper during salaah is makruh? I heard in a lecture that Aisha radiAllahu anha would switch her ring from finger to finger to keep the rakaats in record. And also the qawl of Ibrahim an Nakhai that there is no harm in doing so. True?

Q: I went to a Masjid and seen that the Muazzin calls the azaan with only one finger in his ears. The other hand is down. Is this authentic?

Q: I read somewhere with reference to Radd ul Mukhtaar that if the picture is behind the person it is Makruh Tanzihi.

Also I read another reference that if the picture is at the left, or right or behind than it is makruh tanzihi, but if the picture is in front than it is makruh tahrimi, the reference was Fatawa Qadikhan 1/119. Can you please re-check this ?

Q: What is meant by not receiving the reward of salaah?

Q: If Salah is not valid, how does one then repeat it thereafter individually or what should be done?

Q: Is it okay for a clean shaven person to give the azaan?

Q: Must a Hanafi fold his hands after ruku when he prays behind a imaam who does longer zikr than ''Rabbana lakal hamd'' such as;

رَبَّنا وَلَكَ الحَمْدُ حَمْداً كَثيراً طَيِّباً مُبارَكاً فيه

Rabbana wa laka l-h'amd, h'amdan kathiran tayyiban mubaarakan fih

Q: Is it permissible for an imaam allowed perform Jumma salaah without a beard and can he wear short sleeves whilst performing imamat? What is the ruling amongst all mazhabs?

Q: What is the last moment within which if a person joins the Imam in congregation Salah then he will get the congregation?

Q: If one started to perform tahajud salaah, suddenly he remembered he was impure. Does one need to make kazaa for the same?