I am not sure you are just looking around on the internet, but if you are serious about buying now or in the future, time frame is not really important to me at this time. But if you do want to buy, once you work with
a trusted Buyers Agent which does not cost you a commission, then this Realtor will not only send you all the properties available in your price range, size, type and areas / neighborhoods or zip codes you want to consider, and then if there are no additional photos sometimes the listing agent has some, but has not posted them, or a showing can be arranged so that you can see for yourself....
Hope this helps you at this time, but may be you were just wondering why some properties have interior photos and some do not... It is sometimes because the sellers do not want their inside home photos displayed or the listing agent has not yet had the time to take them or any other reason.
If you need add. help, just e-mail me