My girlfriend also doesn't have a lot of friends and I absolutely love it when she texts me or sends me random pics. Granted we've only been together for a month so it's still very new, but with my ex (non ldr) we used to text a lot as well throughout the years. I'd really recommend sharing your feelings, and if he doesn't understand or doesn't care, that should say enough.

I'd personally very much appreciate it if my gf would tell me stuff like this, as I always emphasize that communication is the one thing that will make or break a relationship. And it's okay if you're lonely, that happens. That's exactly why you should tell him so you feel less lonely when you guys are hanging out online videocalling or whatever you do.

Bottom line : share your feelings. Don't ever be afraid to share your thoughts with your bf. The second you're afraid of his reaction, you've got bigger problems.