I am only on day 25 and I do not know whether it gets any better after some amount of time, but I can tell you this - I was doing it until I was depressed with or without it and I made my choice to rather be depressed without it. The cravings for me disappeared within 2 weeks of not using social websites and not looking at ANY pictures.
I saw some people asking when the cravings will go away. To answer that... I think that it is pleasurable to have an erection by itself and there is no need to add more stimulation for that pleasure. You should learn to enjoy those cravings when they are there. After all, it means that you are normal.
Another thing is that I personally find it worse to have an emotional imbalance than to have cravings. Feeling depressed/anxious is worse than feeling pleasure, ain't it?
So, the cravings have disappeared for me long time ago, I had several wet dreams and I feel no urge to masturbate. Yet, I am still looking forward to the day when I finally get rid of apathy, depression and all those negative feelings. That's much worse than having a constant erection or need to masturbate.