Screenshot 2 (My Accounts): Make the category and item labels smaller (like in the built-in contacts app probably).

Screenshot 3 (Account details / "Google"): Maybe make the password only reveal itself after being touched? This could avoid over-the-shoulder password stealing problems. For example, the password could be listed as "****" and when touched, it gets revealed (maybe after a confirmation?). The "copy" button would still work - in some cases, this could allow you to copy'n'paste the password without even seeing it in plaintext on the screen.

Screenshot 4 (edit sheet): The affirmative action could be named "Save" instead of "OK". Also, the password could again be displayed as password field, with a "show password" checkbox below it that toggles hiding/showing of the password (like in WLAN authentication dialogs where it's called "Show password" or "Display characters"). Again, most of the time you could enter the password without being visible on the screen.

HTH