My phone shows about 14MB of available user storage. The data size of the picture files determine how many pics. 14mb would be sufficient capacity for around 280 pics @ 50k each or 14 pics @ 1 mb each.
There might be a down side to clogging the phone with pictures. Being not sure, I use a removable memory card for that sort of storage.
Micro sd cards are cheap now ESP the 2-4 g sizes like under 10 and less than that online. When you fill up the memory on ANY phone it slows down the os even a primitive os like the 900. The 29 dollar pkg at Wally came with the 4 gig card.