Radiation Pattern Check

Hello,
Can someone please check my radiation pattern for a multiband coaxial fed patch antenna and tell me if they are fine. If not, what should be the improvements?

Urgent help needed !
Thanks in advance :)

1. Is it necessary that the radiation pattern be observed at phi=0 and phi=90 only ?
2. Is it fine to have a negative gain at phi=0 and positive at phi=90 ?
3. Is there a particular pattern to be observed ?
4. Should we check gain or directivity ?