我最喜欢的动物是兔子，因为兔子很可爱、很美丽。它有两只长耳朵、小眼睛。它还有四只脚。它的脚和身体相比很大，也很强壮。它还有短短的胡须。 它的身体很干净，性格很温顺。我很喜欢它。 根据我的了解，我的朋友最喜欢的动物是猫。它有两个耳朵。它的耳朵既短又干净。它的尾非常长，也非常漂亮。它的胡须只有一个颜色，那便是白色，又长又漂亮。猫很漂亮也很可爱，所以我的朋友很喜欢它。

【它只有两个耳朵】 It means a rabbit ONLY has two ears, which suggests its ears should be more than two. 【它只有一个髯】 I'm not sure what you want to express. 髯 means moustache or beard, no one would only have one beard. BTW 髯 is an ancient Chinese word. You can just say 胡子/胡须.

corrections: 1. 因为兔子又可爱又漂亮 2.它有两只耳朵和眼睛 3.他的耳朵很长，眼睛很小 4.它有四只脚（I don't know why you used 他只有 or you really think it's not common to have 四只脚？） 5. 它的脚很大，也很强壮 (or 又大又强壮) 6.它的胡须细长细长的（髯 is quite old fashioned to use, you could say 胡须） 7. 它的身体很干净又柔软 For the send paragraph, I think the other answer on this page is already helped you with the grammar problems. （Two little tips, 1. you were using too many 它, which makes the article sounds a little bit weird, just remember to use some transition words to make articles natural, like 并且，而且，然而 or 首先，其次 etc. 2. if you want your articles to be corrected, you could put them on Notebook section on italki which can make answerers correct them more easier and I'm sure you can get more answers.）