I think you need to keep studying. Your first one is OK, but the rest... I lived in Japan for 3 years. Japanese people would not understand you if you said some of these things to them.
2. What... I don't even know what you're trying to say. At all.
3. This literally translates to "Are anime boobs big?" But it's really awkward in how you phrased it.
4. Are you trying to say: "Are cherry blossoms beautiful?" That's what I get from it. But you have a ない (nai) there. That shouldn't be used in a question in that way. Ever. And if you're not trying to make it a question, you need to drop the か (ka). か is pretty much like the Japanese equivalent of a question mark.