Developer Motivation?

[Spelos]

You said that you have done quite some stuff, even a monster that's working, not many can do that so I would definetely like to see that!

Ok, even tho I find it a little inappropriate... But I guess this counts as motivational thing.
Here is a fully animated working and talking NPC of Kate and my monster (from my mod Regression):

Spoiler below!

just taking a break for a week or two from work might be just something you need to get your motivation and inspiration back.

Ok, however I'd be careful with that. Many projects of mine ended because of that little break. When I usually decide to take a break, It's permanent.

That brings me to another "tip":
Make a playable version as early as you can. Because a large boost in motivation, at least for me, comes from finally playing the thing thinking: "Yes, the scripting was hard, modeling and even map design, but it looks awesome." moreover you can let your friends play it.