I've recently come across a very useful website! It's the Yoga Journal magazine website, which has a handy section to find yoga postures according to what you are looking for: anatomical focus (ie. hips), therapeutic application (ie. back pain), and contraindications (cautions, ie. headache). Once you do a search, it'll list relevant postures, and you can click on them for a photo, information, and instructions. There is also a master list of all the postures, named in Sanskrit as well as English.
If you're wondering what postures are helpful for your dosha, you can check out my earlier posts listing which ones are specifically good for Vatas, Pittas, and Kaphas.