Hm, I think it's because you aren't having enough variety. In your first pictures, you was drawing more stuff, now you are just painting ponies in one style (headphones and mostly faces, upper body parts), idk... maybe more variety could solve your problem or trying something totally different...Sad Pinkie... oh, bad times when even Pinkie isn't happy.But I am sure you can get past it and please us with another ponies/whatever.