Things which render the Salaah Makrooh

Q: If an imam recites the 1st 15 verses (i.e. 1st ruku) from (1-15) of Surah Maryam in his 1st rakaat of fajr salah and in his second rakat recites 25 verses (i.e 2nd ruku) from 16-40, is the salaah valid?

Q: Is it permissible to perform Salaah with a short-sleeve kurta?

Q: If a person does not have a topee but he has an American cap, should he perform the Salaah wearing the American cap or should he perform the Salaah without a topee?

Q: If there is a animated picture beside me when praying, is it sufficient to place some a shield before it so that it is not visible anymore to me from every angle of my prayer place, or must it be totally packed in?

Q: Offering Salaah in front of a mirror is correct?

Q: Please provide a detailed well-proven answer with regards to performing salaah with shoes on?

Q: Is it permissible to look quickly at the clock whilst reading sunnats, to make sure one does not read too long rakaats and miss the takbir oola?

Q: Should you say alhumdulillah if you sneeze during prayer or wait till you have finished the salaah?

Q: In some kitaabs like taalifat rashidiyyah it is written that it is mustahab to repeat the salaah prayed behind a faasiq (the one who trim or shave less than a fist lenght) and in ahsanul fatawa it is writen that if the salaah of a muqtadi become makrooh due to the salaah of imaam become makrooh. What is understood is that it is mustahab for the muqtadi to repeat the salaah prayed behind a faasiq. Please confirm?

Q: When in prayer what kind of movements are allowed? For example if a person sneezes or if he feels like he might, should he cover his nose beforehand? Also, if a person leaves his saff and therefore creates an empty spot in a row, should another musalli move and cover his spot while he is praying to 'fill the gap' as mentioned in the hadith of Rasulullah (Sallallahu Alayhi Wasallam)?