1.“As is vividly depicted in the pictureabove,” 是as引导的非限制性定语从句,as指代后面所说的内容,即,“in the middle stand two individuals,showing us a striking contrast between two kinds of people:the self-satisfied person with little learning,shaking no to the pot of knowledge,while the other more learned person,thirsting for knowledge,welcomes it with open arms”,as在非限制性定语从句中作主语.
2.in the middle stand two individuals是整个句子的主句,其中,two individuals作主句的主语,stand作主句的谓语,in the middle是介词短语,在句中作状语,表示地点.该主句中使用了完全倒装句型,原因是：表示地点的介词短语或副词提到句首时,主谓要完全倒装.showing us a striking contrast between two kinds of people 为现分短语,在句中作状语.striking是现分作前置定语.learning为动名词,作介词with的宾语；shaking应为shakes,作the self-satisfied person的谓语；thirsting for knowledge为现分短语作后置定语,修饰learned person.
3.英语中冒号、分号的用法与汉语中用法一样.冒号前后是一个句子；而分号前后则构成意思或结构平行或对等的两个句子.
该句的句意为：正如上图中生动描绘的一样,在画的中间站着两个人,（这两个人）形成了鲜明的对比：学少自满的人对知识摇头说不,而另一位博学渴求的人则对知识张开双臂双迎.
（个人意见,权作参考）