In the envelope were three photographs more or
less the same,though taken from diffirent angles
:a tall delicate Negro man wearing a calico skirt and with a shy,yet vain smile,displaying in his
hands an odd wood sculpture,an elongated carving
of a head,a girl's,her hair sleek and short as
a yong man's,her smooth wood eyes too large and
tilted in her tapering face,her mouth wide,
overdrawn,not unlike clownlips.On a grance it
resembled most primitive carving;and then it
didn't,for here was the spit-image of Holly
Golightly,at least as much of a likeness as a
dark still thing could be.
最后一句的结构我还是不明白，尤其是最后的could be,是什么用法？请帮忙，谢谢！

信封里是三张照片，从不同角度拍的，大致相同。一个高高瘦瘦的、穿印花布裙子的黑人，面带羞怯、空虚的微笑，手捧一副古怪的木雕像。一个细长的女孩的头像，像男孩样的光滑的短短的头发，倾斜的、安详的双眼在瘦长的脸上显得超大，嘴巴很宽，像小丑一样夸张地咧开。一眼看上去，极像原始人的雕像，细看却又不是，因为这太像Holly Golightly了，至少这个又黑又呆的东西是尽可能地照她的模样刻出来的。

as...as xx could --尽可能地，就是这雕像尽可能地像。

翻译过程中得到伽伽111和shuibingkiev的帮助，特在此致谢！