I'm a dev too, but have some photoshop skills and have to learn this stuff myself. I can really recommend that one of you gets to know Photoshop/Pixelmator/Sket

I'm a dev too, but have some photoshop skills and have to learn this stuff myself. I can really recommend that one of you gets to know Photoshop/Pixelmator/Sketch and browses a lot of other product pages and apps (so you can "borrow" there.. stealing shamelessly is often a good idea ;)). A product needs someone who cares about that stuff.