I think it needs thin, sleek wings (doesn't sweep out very far so there's a steep angle.) It looks a bit too blocky as is. It's a great model. One cheat that may work to get a texture: Position the camera so it is directly above the ship and shine a really bright light on it. Make the ground and sky black. Render and Prt Scr the image (assuming you're on a PC. Haven't a clue for Macs.) Take the image into a photo editing program and Paste it as a new image. Save it as 1024 x 1024. Make a new terrain in Bryce and load the picture as the terrain. Export the terrain as an .obj. Now UV map it. You may be able to use this map for texturing the original model, or the newly created terrain may be good enough to use with the map. (I can't take any credit for this idea. It's on someone's site for making a bug.) Hope this works!