Answer: (1) Metal crafts in neoclassicism period, especially precious metal crafts, have obviously got rid of the fashion of affectation and deliberate pursuit of flashy and beautiful effects in Rococo period, showing exquisite and elegant, solemn and subtle technological characteristics. Judging from the modeling style and decorative features of a large number of metal craft products, they were greatly influenced by ancient Roman silverware. The metal crafts of this period are mainly reflected in the dining utensils, sacrificial vessels, furnishings, furniture decoration and interior decoration used in the daily life of the court and nobles. On the whole, at this time, the metal technology is mostly used as a practical one, but less as a decoration. It is a remarkable feature that metal is combined with other materials to make handicrafts. Therefore, the decorative techniques of metal crafts in neoclassicism period are rich and novel.

(2) Coffee set was specially made by French metalworkers for Napoleon's wedding, with elegant modeling, gorgeous decoration and exquisite workmanship, which fully embodies the style characteristics of neoclassical art. The mouth and handle of coffee pot and milk cup are graceful and streamlined, which endows the works with flowing and dexterous charm, while the octagonal shape of sugar tank presents rich figure, and the linear change is in sharp contrast with the soft curves of milk cup and pot.

(3) In addition to dining utensils, metal furnishings and decorations have also been vigorously developed in the neoclassical period. From the perspective of style characteristics, the works of this period have a strong classical carving style, and the expression techniques are extremely delicate, especially the facial expressions and clothing texture of the characters are vividly portrayed. The whole image of the French work "Bronze Portrait" is beautiful and full of line changes. The whole image is full of strong momentum and great vitality, just like an ancient Greek goddess who is ready to come out, which makes people fall for it.