About Photoshop, why dont you take a look at Gimp?,
its free and a very nice and powerfull program. Everyone seems to be obsessed with PS because it is the more broadly used.

Your ship is quite cool and well made, of the fantasy type more than scifi.

About rotating, is better to use the channel box. Highligt rotate x or y or z, and instead of use exact numbers you can hold the control key and move the mouse pressing the middle mouse button to change the values at your liking.