Liyakatali Takim

There is no harm in her wearing tinted lenses. However, she should observe what is required in hijab - that is, modest clothing and behaviour.

The Maraji' have generally ruled that wearing things like leather belts in salat is not allowed if the leather is not slaughtered in an Islamic way. See Islamic Laws of Ayatullah Seestani's Tawdhihu'l Masa'il p. 160.

As far as sea food is concerned, only that fish which has scales may be consumed. In addition, it must be alive when caught from the water. Crabs are not classified as fish and may not be consumed. There is some differences amongst certain ulama' regarding lobsters but the general consensus seems to be that it should not be consumed. See Ayatullah Seestani's Islamic Laws p. 489.

The growth of the beard that you described (covering the chin) is sufficient. Having the full beard is not wajib. Also, please note that on Shar'i issues, one has to fulfill what is incumbent even if the parents object to it.

You can only change taqlid from one living Mujtahid to another one if, after research, you are satisfied that the second Mujtahid is the most learned one (a'lam).

I have not seen a fatwa which explicitly prohibits tattooing. However, one has to be careful what picture or image will be tatooed. Anything which is immoral or with sexual connotations will, of course be haram. Similarly, it has to be remembered that praying with clothes which have images on them is makruh. One could possibly extend this ruling to cover tattoos also. My personal advice would be not to undertake this practice which has no Islamic basis. May Allah (SWT) guide us all.

Writing of fictions or novels is permitted provided they do not go beyond the bounds of shari'a. So, for example, writing a novel which could clearly lead to lustful thoughts or acts is haram, so is writing any form of material which is insulting to Islam or God, the Prophets, and Imams.