Wow, this is great! It's so screen-accurate but you've brought your own style to it, which I love. Love the glow on Mjolnir and Tony's suit, and the blur effect on Cap's shield! Your Loki is great too! Keep up the amazing work! <3
If you'd like, you can purchase the rights to use the image on your card for $25. If you decide to, you can send payment through Paypal (my email: email@example.com.) For this fee, you have permission to use the image only on your bank card. Other usage rights would be an additional fee.
Let me know what size the image needs to be for the card and once I receive payment I can email it to you.