Combined with the original text, it should be explained as follows:
Painting: painting. Novelty: A novel idea. Statue: the routine of painting. Send: delegate. Wonderful reason: charm. Together, (Wu Daozi can) draw novel ideas in the old painting routine, and entrust exquisite charm outside the bold painting style.
In fact, these two sentences are generally regarded as Su Shi's interpretation of his own literary pursuit, that is to say, these two sentences are not only Su's evaluation of Wu Ci, but also the evaluation of Su Shi's works (especially literary works) by later generations.
Han Yu and others, who were earlier than Su Shi, created a very peculiar school of Tang poetry, that is, the spirit of "language is not surprising and endless", which had a bad influence on the development of Tang poetry and later Song poetry. In Song Dynasty, Wang Anshi and others were influenced by it to some extent. Su Shi pointedly pointed out that poetry should be "innovative" in terms of "statutes" and should not pursue adventure and eccentricity excessively. At the same time, as the founder of the uninhibited school in Song Dynasty, he also practiced the literary proposition of "putting the wonderful theory outside the uninhibited".