Only collect silk, leather and metal!
Fiber and cloth are for one-headed peasants!
(What are the chances of you taking screenshots along with this?)
If I knew how to take screenshots, I would be '~' It would be a bit easier then typing exactly what a treasure looks like.
You have removed all the offending fabrics from your collection. It's worth noting that at this point you are in room three and you have enough arrows to turn every human in town into a porcupine and enough flutes that you can play a tune one one with each head. That is, if you knew how to play the flute. Not to mention, your sixth head, due to a severe concussion, can't exactly do fine manipulation like picking up stuff. You tried and accidentally crushed a chest you were trying to open.
You also found a leather backpack large enough for you to wear like a bracelet around your front feg. That simplifies this greatly. You realize you have only seen one guard, not counting the current leader, and start to be cautious.
Make sure you grab the copper whip. Collecting the weapons and armors of fallen enemies is fun. Better make sure we have more collecting of dead people things by clearing more rooms!
You had made sure the grab the weapons, can't forget those can we? In fact you have grabbed every weapon you have seen so far. They are useful for things you can't bite, like a creature with foul blood. Sharp weapons make good throwing weapons. You found another leather backpack that you hooked to your current backpack. You have also found a masterwork copper axe. Nothing's added to it, but its free of any imperfections other than the ones from battles it was wielded in. You just found your new favorite treasure so far.
You need to have a chest full of your slain enemies meat and bones and heads, (you can do that by stealing a chest, and using the 'p' command to put things in the chest, the chest will go in your lair when done. ALso if your hydra can talk you should claim the lairs site as your own. (this should prevent night creature atatcks) if you sleep inside the lair.
You think about putting a chest full of slain enemies in your lair for a second, then decide that meat's meant to be eaten, but you'll happily do this with the leftover bones.
Unfortunately, hydras (I think the plural is actually hydrae or something along the lines of that but in DF it's hydras) can't speak, but I've made them intelligent. I haven't had any night creature trouble ever since I've moved the hydra into the lair.
You burst into the next room and start to grab more treasures. At this point you have enough weapons to equip an army and two masterworks, the other is a stack of silver arrows. You are putting all of these weapons VERY deep into your lair or you know you'll regret it later.