Struggling to grow

I'm getting kind of tired with my drawings at the moment.  I seem to be struggling more and more with the creative side of the work. Technically I think I'm as as strong as ever, but the ideas I have for work are starting to feel really flat and shallow.  My ideas seem tired and cliched, without the spark to make them stand out.

I look around DA and the work I love is technically beautiful, but also always really interesting. Sometimes it's a great concept, sometimes someone has just created something really simple that is so well crafted and styled that it becomes a great image.  If I draw a figure I always seem to be finding ways to make them exciting and interesting but I never manage to turn somethign simple and ordinary into a great image.
It was a recent image by Charlie140588 ( fav.me/d2qgzl6 )that made me question this a bit more. Her picture was a fairly ordinary figure - a girl wearing a hat and holding a flag - but it was turned into a great looking image through the handling of all sorts of elements, including the pose, use of colour, visual style, etc.

My girlfriend says I'm not doing enough to inspire me, and I guess that is part of it.  Ideas have to come from somewhere, and between work and relaxation time I'm not doing much to flex the old creative muscles.

So what do I do? I don't want to keep drawing chicks with weapons unless I can make it interesting.  I can definitely push my skills with observational work, although I still need to do more of this, but I'm an illustrative artist, I believe my best work should come from my ideas, not from a secondary source.
How do I find new inspiration?

It's a boggle