Art is a diverse range of human activities in creating visual, auditory or performing artifacts (artworks), expressing the author's imaginative, conceptual ideas, or technical skill, intended to be appreciated for their beauty or emotional power. In their most general form these activities include the production of works of art, the criticism of art, the study of the history of art, and the aesthetic dissemination of art.
The three classical branches of art are painting, sculpture and architecture.
Majority of our Shia Masjids all over the world do not place pictures of scholars or founders of the mosque, but in some places there are pictures of respected scholars where the culture of that area allows placing pictures. Those who place picture for respected Scholars do so to express gratitude to the great services rendered by them to the community. We don't have any authentic evidence against placing pictures in Masjid as far as it is not for worshiping it and it is just a picture and not a statue. The pictures should not be in the direction of Qibla, means should not be faced by people while performing Namaz because it Is Makrouh (disliked) to face a picture while performing Namaz.
Muslim should not promote any item linked with polytheism or any wrong worship under any excuse. Images of idols or wrong worship places should not be shared because it causes publicity of the wrong.
If the person who is posting such material claims falsely that the material is his material, it will a lie and a sinful act.
If he does not claim any wrong claim but he is just posting a material for the benefit of people, with out harming any one, then it is allowed to spread useful knowledge which helps people and does not cause harm to any one.
Yes it is allowed to paint as far as it is not statuary or sculptural.
The narration which is in our books of Hadeeth from the Prophet (SAWA): Jabrael came to me and said: We, the angles, do not enter a house having in it a dog or a statue or a vessel in which people urinate. Al-Tahtheeb 2:377 and Al-Mahaasin 615.
Some Wahabi Shaikhs translate the Arabic word تمثال as painting or photo which in fact away from the meaning of statue.
It is Makrouh (Disliked) to make or keep paintings of full animate objects.
Yes it is allowed as far as the picture does not have anything against the rules of Islam. It should not be a picture of a female with out Hijab or any person or item or image which is not permissible in Islam.
Yes it is the same because drawing living being full image is not permissible whether in real life or in digital 3D.
Harming people is not allowed in Islam. If it does not harm them now or in the future and you are sure that they will never object on it, then it becomes permissible.
You should try your best to get your previous pictures ( with out Hijab) and keep them away from public display. If you could not get all of them, you will not be responsible about them as you were not a Muslim when the photos were displayed. Now when you are a Muslim, it is not sin on you as it is out of your ability to remove it.
Congratulations on adorning the attire of Islam and wearing hijab. In regards to previous images of you without hijab, no, it is not considered a sin. What you are able to do is for your comfort and peace of mind, if you have access to these images, ask them to be kindly removed, and hopefully they will comply.
With prayers for your success.
The drawings claimed to be similar to the image of Imam Ali (AS) and Imam Husain (AS) are linked with some cultures in places where Muslims live. Muslims in Eastern Europe, Turkey and Iran accept these drawings because of the common culture in those places accepts drawings of divine personalities, while Muslims is the Indian sub-continent, Indonesia, Malaysia and Far East do not have such culture. Many Shia scholars in these countries do not allow such drawings. Our leading Ulama in the Hawza say that these drawings are not more than the imagination of the persons who draw it. No one is allowed to claim that such drawings are the real image of the Infallible.
Yes, it is permissible, and there would be nothing wrong with this.
And Allah knows best.