Database overview

I'm working on a new website, below you can view my database.
anyone has a better idea than this?
I need it for school, so it's gotta be perfect!

thank you very much!

[MYSQL]NEWS
news id
date
message
imageid
url
title

IMAGES
imageid
url
Category

COMPANY
Companyid
Accountid
imageid

ACCOUNTS
accountid
companyname
firstname
lastname
phone
email
password
policy

ADDRESS
accountid
address
zipcode
city
type

POLICY
policy
type

MAILBOX
mailboxid
sender
receiver
message
senddate
receivedate
status

HISTORY_MAILBOX
mailboxid
sender
receiver
message
senddate
receivedate
status

ADVERTISEMENT
addid
viewed
start_date
stop_date
accountnr.

PRODUCTS
productid
brand
type
last_editted
viewed

PRODUCT_PER_COMPANY
Percompanyid
productid
accountid
price

PRODUCT_CATEGORY
Product_categoryid
productid
categoryid

CATEGORY
categoryid
name
parent[/MYSQL]