你可以说：

　　1.Heistall【主语加be动词,直接加形容词】他高.后边可以用short,thin啊什么的

　　2.Hehaslonghair【主语加have或has加修饰语】

　　3.Shewasverythin,with【with表示有什么】bigeyes

　　这里有个作文你看看

　　MynameisWangXiaodi,thisyear11yearsold,IreadthenewRiverCenter,fourth-gradeclass.Ihaveapairofbigeyes,asmallnoseandabigmouth.Myfavoritethingistheviolin,booksandcomputers,Iliketodoisplayingtheviolin,listeningtomusic,singing,playingonthecomputer,sittingintheclassroomorathomeadaze.Ihaveagoodfriend,hisnamewasKingTongQi,shewasverythin,withbigeyes,asmallnoseandasmallmouth,herfavoritesubjectismusicandpainting,isaquietgirl.

　　希望帮到你