All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and messenger.
We will answer your questions in the following points:
1- Criticizing the wife too much for insignificant reasons or despising her and so on, are contrary to living in kindness with the wife, which the husband is commanded to observe as legislated by his Lord. For more benefit, please refer to Fatwa 88304.
2- The prayer is the most important pillar after the two testimonies of faith and it is the relationship between a person and his Lord. Neglecting the prayer and delaying it after its prescribed fixed time is very serious. So, you should personally repent of this sin first, and then advise your husband and invite him to perform the prayer. For more benefit on the obligation of preserving the prayer, please refer to Fatwa 11207. Also, for more benefit on the conditions of repentance, please refer to Fatwa 86527.
3- It is not permissible for a man to make accusations concerning his wife's conduct without evidence. In principle, one's wife is deemed innocent until she is proven guilty. Even if it were presumed that she was proven guilty, he should advise her in a soft and gentle manner. It is with this manner that advice yields good results. Please refer to Fatwa 92529. However, we warn you here against raising your voice against your husband as this is considered disobedience. So, you should be patient about his provocations, if any.
4- The Hijab, which is covering the whole body – apart from the face and the hands – is an Islamic obligation on the Muslim woman according to the view of the majority of the jurists as we have already clarified in Fataawa 83033 and 84053. Woman must abide by Hijab even if her husband does not order her to do so. The obligation is even more emphatic if her husband orders her to wear Hijab, as, in Islam, the wife is enjoined to obey her husband in what is good. A Muslim does not know when he/she will die, so he/she should not delay repentance. Hijab that covers the whole body including the face and hands is a controversial issue. The view which we adopt here in Islamweb is that it is an obligation as well. A Muslim woman is obliged to abide by it especially if her husband orders her to do so. But the matter is less serious than the first [covering the whole body with the exception of the face and hands].
5- A man should educate his wife instead of criticizing her. He should guide her in a kind manner and take her to places of goodness, like circles of knowledge in Islamic Centers and the like. He should be a role model for her in doing good by him staying steadfast on the truth and uprightness. Allaah says (what means): {O you who have believed, protect yourselves and your families from a Fire whose fuel is people and stones, over which are [appointed] angels, harsh and severe; they do not disobey Allaah in what He commands them but do what they are commanded.}[Quran 66:6] Ibn 'Abbaas interpreted 'protect your families' as meaning, “teach them and discipline them.”
6- It is not permissible for a woman to ask her husband for divorce except in certain cases which the jurists have clarified. They are discussed in Fatwa 131953.
Allaah Knows best.