Answer by taking a quote from the following article:

Sir Lawrence Alma-Tadema,  (; born Lourens Alma Tadema Dutch pronunciation: ['l^ur@ns 'alma: 'ta:d@,ma:]; 8 January 1836 - 25 June 1912) was a Dutch painter of special British denizenship.

Alma-Tadema's works are remarkable for the way in which flowers, textures and hard reflecting substances, like metals, pottery, and especially marble, are painted - indeed, his realistic depiction of marble led him to be called the 'marbellous painter'. His work shows much of the fine execution and brilliant colour of the old Dutch masters. By the human interest with which he imbues all his scenes from ancient life he brings them within the scope of modern feeling, and charms us with gentle sentiment and playfulness.  From early in his career, Alma-Tadema was particularly concerned with architectural accuracy, often including objects that he would see at museums - such as the British Museum in London - in his works. He also read many books and took many images from them. He amassed an enormous number of photographs from ancient sites in Italy, which he used for the most precise accuracy in the details of his compositions.  Alma-Tadema was a perfectionist. He worked assiduously to make the most of his paintings, often repeatedly reworking parts of paintings before he found them satisfactory to his own high standards. One humorous story relates that one of his paintings was rejected and instead of keeping it, he gave the canvas to a maid who used it as her table cover. He was sensitive to every detail and architectural line of his paintings, as well as the settings he was depicting. For many of the objects in his paintings, he would depict what was in front of him, using fresh flowers imported from across the continent and even from Africa, rushing to finish the paintings before the flowers died. It was this commitment to veracity that earned him recognition but also caused many of his adversaries to take up arms against his almost encyclopaedic works.  Alma-Tadema's work has been linked with that of European Symbolist painters. As an artist of international reputation, he can be cited as an influence on European figures such as Gustav Klimt and Fernand Khnopff. Both painters incorporate classical motifs into their works and use Alma-Tadema's unconventional compositional devices such as abrupt cut-off at the edge of the canvas. They, like Alma-Tadema, also employ coded imagery to convey meaning to their paintings.

What gave him inspiration for his style?
He amassed an enormous number of photographs from ancient sites in Italy, which he used for the most precise accuracy