I suggest you'd better choose some english novels which are familiar to you and also have chinese version. Read the chinese version at beginning. I think it's helpful for your understanding. Then you can choose some short novel to read. If your level is high, ignore the above. I recommend a female writer named 三毛, her works are very attactive.

ka3tong1 is the exactly same as cartoon, it's typical chinese words formed according to the english word's pronunciation. There are also other words like ma3sai4ke4(马赛克) is mosaic, ke3kou3ke3le4(可口可乐) is cocacola, ke4long2(克隆) is clone,and so on.

Both are right, but they have different meaning, "天空的照片很漂亮"means the photo of sky is beautiful,while"照片的天空很漂亮"means the sky in the photo is beautiful.