We can use some and any as a plural form for countable nouns.
Examples:
o Here is a picture of Titanic.
o Here are some pictures of Titanic.
o There is an ostrich roaming the streets.
o There are some ostriches roaming the streets.
o Is there a duck swimming on my pond?
o Are there any ducks swimming on my pond?
We may omit some or any from sentences or questions without affecting their meanings.
Examples:
o There is some dirt under the table.
o There is dirt under the table.
o Do you have any children?
o Do you have children?