I think the new artwork is okay, but it needs to more varied. I need to be able to tell the different items apart, not just that they are leather or ore. Also, to differentiate between raw and processed materials would be very helpful. I think a combination of what you have now and what you had before. Keep the task icons how they are now, but change the inventory to pixel art.
Or, color organize each of the tier items for easier navigation. Raw Hide (tier 1) and Thick Hide (tier 2), for example, look identical to the process materials Coarse Leather (tier 1) and Rugged Leather (tier 2). There needs to be a different icon for processed and raw materials, and different colors for tier levels.