1) Put the character in Brawl and take an in in-game screenshot when you want a specific pose, save the picture to the Wii, then go into normal Brawl and copy the picture to the SD card; finally, move from the SD onto your CPU the .bin, and use Bin2Jpg to turn it into a .jpg
2) (This only applies to retextures of a character with a CSP already)Use my tutorials here(
http://forums.kc-mm.com/index.php?topic=68678 ) on retexturing here to recolor the CSP to look like the new one.
3) (Most likely the method you want to use)First, preview the model in BrawlBox; then, use the panel on the left to select the bones, and you'll see things to rotate with appear on the main part; rotate the bones to what you want, and exit the preview; then, replace your normal textures with the custom ones, then preview the model again, and disable the bones. Then, after you're done with the picture, MAKE SURE NOT to save it, as the rotation of the bones will be kept if you save it.