I read a topic recently on Bolter and Chainsword about painting motivation, and felt that I wanted to have a say in how to keep it. I then realised that the advice I gave might be useful just generally. I'll post it here verbatim, and hopefully someone will take something from it :)
'Honestly, my motivation is paint whenever I feel like it. Everyone
has days when they aren't going to be feeling that hobby bug itching,
and that's fine.
Fit in what you can, when you can. Never force yourself as your work
will be half-hearted. I tend to paint for 20-30 mins at a time, four
times a week...maybe 5 if I really have something I want to do. You'd be
surprised what you can complete in 30 mins, and with a burst at the
weekend of 2 hours you can finish a whole unit.
Find out what's not motivating you. If the model you're painting
bores you, switch it up. I painted a techmarine with Thunderfire Cannon
recently, and let me tell you. Dull. Dull dull dull. So I painted a
five-man Tactical squad at the same time, switching between the two as
and when. It took a little longer, but it pushed me through and now I
have two units done.
If you really find yourself at a loss, ask your friends what they're
working on and what has them excited. Enthusiasm is infectous. You'll
find yourself getting excited and motivated.
And lastly, never ever look at what you have left to do. Look at what
you have done, and think how awesome the rest will look once done.
That works for me anyway
PS - Failing all that, start a plog. You'd be surprised how much
getting your stuff on here, building a background and having people
comment helps with everything.'