what's the mistake in this sentence ? how we can correct it?
她的手表又样子好看，又颜色漂亮

Question

Answer

她的手表样子又好看，颜色又漂亮。

From the grammer point, 又...又... is used to modify adjective words, so should be followed by adjective words. 
But from the sentencial logic, 又...又... is used to describe same aspect of the subject. So it is better to use 不仅...而且.... 
Hope it helps!

Answer

她的手表不仅外表好看，而且颜色漂亮。That’s my point.

Answer

她的手表不仅外表好看，而且颜色漂亮。That’s my point.