I have two tips that may seem a bit strange, but they are things that I have noticed again and again over the years. They don't just apply to drawing, but to anything where you are trying to motivate yourself to do something - novel writers spring to mind.
Tip 1: Get a haircut!Often I have struggled to get my brain into gear, both with drawing and with things in the past like studying for Physics exams. Time and time again though, I have come to realise that after having my hair cut, my concentration and my learning ability have increased. Why this is, I have no idea. Maybe it's the removal of weight from my head or increased brain-cooling!
Tip 2: Dress up a bit!How many of us just wander round the house in scruffy clothes? Well I do. They are comfortable and so you'd think that you would be able to work better in them. Wrong! I have often noticed that I feel more up to doing things that require effort if I'm dressed a bit more smartly. I don't mean put a shirt and tie on, or dust off your tux. I mean just wear things you would be willing to be seen outside in.
I know these sound ridiculous, but they really do work, and the combination of the two can give quite a dramatic effect.
Right, one last tip, this one specifically for drawing:
Tip 3: Decorate your desk!I've lost count of how many times I have sat at my desk to draw and have suffered from artist's block. My new solution to this problem is to have pictures of cartoon characters all over the place. Little stickers of Mickey Mouse or Yogi Bear or the like. If you are struggling to get something down on paper, just pick a random sticker and draw what's on it. You could either draw it to look like the particular character, or you could just draw a simple gesture, like I do.
Ok, that's enough tips for now. Next some drawings. I think I mentioned on here recently that I had asked my friend
Craig to collect scrap paper from his office for me to draw on as I'm always conscious of the huge amount of the stuff that I get through sometimes. He's currently fuelling me with a large supply of paper to scribble on, which is great because it removes the worry of waste. Of course the two ultimate benefits are that less money comes out of my pocket in purchasing sketchbooks, just to fill them with practice circles, and also I'm helping (albeit in a small way) to save the planet. What's better than that?!
So here are some doodles made on the said scrap paper:

You might notice the ears. Yes it was drawn from a Mickey Mouse sticker! I also had my hair cut today and am wearing a nice comfy but smart ensemble....see? I'm putting my tips to use!

The above one was Donald Duck. As I said, it doesn't have to look like the character. It's all practice. The next one was just one I dreamed up:

As was this last one:

I did draw a load of other gestures too, but I'm not posting them yet. I'm working on a project for someone I got talking to after buying a Mickey Mouse calculator from them through eBay....
.......no it's not sad!!