①どうですか。 You can use the sentence ①, when you ask someone about your dress you wear. I think this sentence you can use with someone who see, image some thing. ②どうでしたか。 You can use the sentence ②, when you ask someone about how's going on. You don't know someone how to play, do, something. You and someone have not been same place. ③どうしましたか。 You can use the sentence ③, when you find someone is sick seriously. You must help someone for kind.

1，怎么樣嗎？　　（好嗎？） 2，怎么樣了嗎？ （好了嗎？） 3，怎麽辦了嗎？／怎么了？怎么？（問情況）

Just for additional info: ①どうですか。 - present and future time of question. ②どうでしたか。- past time of question. ③どうしましたか。past time with finished action in past. I hope it helps a lit bit.