I don't know what it is. I just went onto an app called BlockBench and changed the colors of a chicken skin. If you could explain the difference between a texture and a skin pack, then I could maybe help more. Sorry, I don't know!
If you go to my profile and go to the first skin I made (It is at the very bottom) it is the duck/chicken skin, that is the skin I want to download to Minecraft... if you can't find that one any of the other skins I made will work. Thanks for your help!
Comradee... to protect yourself from a ghast fireball you can hit the fireball when it comes near you to deflect it back the way it came.... you might also be able to use a shield to prevent any damage from being done.... also fire resistance potions will help with the lava! Hope that this helps!