Hi White Box Gaming!
Thanks for the updated images. It seems to me that the small lock option is much better - I love your potion design and the large lock simply hides the entire sprite. So the smaller locks are much better :) Other than that your inventory looks pretty cool, if there is some kind of inventory space management involved consider adding some kind of empty slots placeholders as it is common practice in most of RPG games. Anyway great concepts, thanks for sharing!
Hope this review was helpful:)
Shifful Studio