Great work on the cards. Did you think about doing altered art/extended maybe full card arts? I know the talent and the work is different for them, but I think many people would appreciate them ass well (maybe more because the card thickness is playable)
Also on the commander problem, it is a good practice to have your commander or in different sleeves or large card or some way you can differentiate it so you don't accidentally shuffle it into your library, put it into your graveyard, etc. but because of the aforementioned shuffle effect you need to have a regular size commander as well with a normal sleeve so if needed you can put it into your library.
(also I vaguely remember reading something that they want to change to rules so in case the commander should be shuffled into a library it is exiled instead - which mean you can have it go back to the commander zone - but as far as I know the rules are not changed yet)