Having trouble coming up with something to draw? No worries - while you'll eventually learn how to start from a tiny seed of a thought and gradually nurture it into a complex concept to explore through design and illustration, it's perfectly fine not to be there just yet.
For now though, here's an idea that might interest you.
Pirates in Every Age
For as long as there have been humans, there have been those who'd sooner take what others possess, than produce value of their own, and there are none as iconic as the pirates of the 17th and 18th centuries. It's almost to the point that one wouldn't blame you for thinking piracy only existed in that time, and in that form - but you'd be wrong. Piracy is almost as old as humanity itself.
From the mysterious "Sea Peoples" who swarmed the Mediterranean and brought the late Bronze Age toppling upon itself, to the desperate hunting of cargo ships in the modern age, as long as there is wealth to be taken, men and women will take to their ships in order to claim it for themselves. And should we extend our reach beyond the confines of this blue-green marble to other planets and star systems, rest assured - we will be space pirates as well.
Pick a time and a place in history - or a world from fiction or of your own making - and show us what form piracy has taken within it. You can approach this from a design standpoint, by showing us the tools they might use, the "ships" they sail, the clothing they wear, and so on, or from an illustrative angle by showing us a moment in their lives.