Hi Johan,
on your problem:
I had this problem for a while also, I could not motivate myself for a personal piece … I think a point that really helps is to choose a material you like or would like to expire with. This helped me a lot. I was doing some of my selfpotraits and experementing with any medium I could find. You should think of the material you would like to use.
Another thing which might be good for you is to start with something you are familiar with, your dragon’s are looking to flat but your torsos are looking a lot better. So maybe you should think of a piece where you can work with your torso … don’t forget this is to find the fun at doing personal work and not to get the best piece ever. So I think starting with something you know better is the best way.
Another thing: Start with doing some idea finding sketches, you can see them also in my thread, where I have a few pages with brushes and than things where I worked with this brushes. Also the pages where I put stuff on people’s head. This is a way to find interresting ideas, compositions and designs. This quick sketches are not planned to be superrealistic but to help you to get some ideas on paper. You also train to work from imagination
This is also a way to challange yourself … “How can I make this believable” it is not important to make it realistic but to make it look as if it would work.
As you know it helped me a lot to do some creative self-potraits. The great thing about self-potraits is that you always have a reference, and you can choose the reference as you want it. As you know it is harder to work from life then to work from fotos. The mirror is somewhere in between. So another advice would be to attempt on a creative sp.
All in all, I think it is important to learn to work from imagination again and to use what you have learned by doing studies in your work … don’t forget what you have learned about light and shadow. When you start rendering, think of your light … make an arrow on your piece to ALWAYS remember yourself from where the light comes. Start with one light source, not two or more. Think where the light hits the object, always think first then draw!
What I always tried to say, start simpel and don’t force yourself with hard things at the beginning but start to have fun doing it. Think of what makes fun when you are doing your studies and try to use this doing personal work 
I hope this could help a little.
Thomas