@uuY_yzeerB, here is a list of skinpacks available for you. You can switch skinpack by running $packs select <ID>, where you replace <ID> with the number of the skinpack you want to select.
Default - 0
Grayscale - 3
Thief - 40
Light_And_Shadow - 49
20:40
Skinpack Updated
Updated @uuY_yzeerB's skinpack to 49 (Light_And_Shadow). You can disable the skinpack by running $packs select 0.