How long ago was the picture of your 3.5 month beard?

Based on your growth at 2 weeks, I would guess that you will end up with something a little fuller than that this time. The other thing I would suggest is that after you get to the three month point, I would take your beard to a trusted barber for a surface trim to tidy everything up. A surface trim will even things out and will set you up nicely with a look you can either maintain or use as a base to grow longer.