Often with me i draw from Filem sometimes and it helps me think a bit and helps me work through challenges. anda could also give a comic strip a try. Like the person before me berkata take a scene atau chapter from a book atau your own mind and draw a little comic strip for it.
From my view of your drawings I've got a little constructive criticism for you. anda lack dimensions. That is something anda could work on trying to make drawings with perspective and add shadows. A good exercise to work on it is exploding box effect. At this link anda can see a pretty good example of it.
link Another thing anda could do i learned this from my art student teacher. anda put dots down in a pattern with curves like anda can make a cursive 1 atau C etc. atau something anda designed yourself as many dots as anda want my first one was about 200 something anyways. Your total number has to be a multiple of three. When anda divide your number sejak three it should come out without a decimal. Once anda have the number anda go to the dot number that it is and start drawing lines from there each dot should have a dot corresponding to it. anda draw a line from that dot number to number 1 and then anda go to the seterusnya one and draw it to two and so on. I believe it was called a helix when it was explained. It should look like a cool spiral type thing when its finished