[header] How to draw curved lines in photoshop [title] Choose the pen tool (p) from your toolkit on the left side of the screen. [step] This is one of the most useful and powerful tools in photoshop, though it is a bit tricky to get used to. It is right above the text tool in the tool kit. 
You can also press p to get right to the pen tool automatically. [title] Make sure that " path " is selected from the options bar at the top of photoshop.