I am developing a Java game that uses sprites for the graphics. It's just a top down shooter and our ship sprites look like the following:

These work fine, but they're hard to create and the artist who created them is no longer working on the game. I could easily create a top down view of a ship in Photoshop myself, but I'm not sure how to get all the angles.
What do you think would be the best program or approach would be for me to create more?