hello :))

i think you've got many ideas on how to fix things, so i'll refrain from what has already been said.  one thing though that i've been waiting for someone to mention, and that you referred to back on page one is pricing.

looking in your store and going through ReadMes to obtain rough dates of release, i can understand why there is a slight increase in your pricing, not to mention that you are having to share revenue with partners.  but back on page one you also mentioned packs by Godin & Seven that were released roughly around the same time as Tina.  both those vendors might also be having a bit more success due to having lower price points than you.  even if you fixed your promo images, etc., personally i would not be willing to spend $19USD on your sisters pack, especially since, as stated in your product description, it is roughly the same base texture for each with colouring adjustments.  but also keep in mind that i am one of those purchasers that will quite willingly go in and edit textures myself, like colouring or mixing make-ups, blahblah, so that i get more 'bang' for my buck.  i don't know how many others might do the same, but surely there is more than a handful of us.  now if the there were at least two identifiably different detailed & exciting textures, then $19USD would be easy and justifiable to drop.

best wishes for improved success!! :))