Custom Paint - Workshop specials.

I think you're asking "How much can I sell this for?" and if so, my recommendation would be "Whatever the frame is worth".

Your first effort is great BUT I'd suggest it isn't necessarily up to a standard you should look to be asking significant money for just yet. You should consider how well the products are bonded... how do you know the paint won't just flake off after a few rides?

I'd recommend you paint a bunch more... for your friends... for free or for cost... explain that you're learning... get your skills up and get some feedback on how the finishes hold up to the rigours of daily use.

Once you have faith in your work, you should calculate a system for figuring out what the finish is worth... cost of products, your markup, plus cost of your time. This is difficult of course because when you're new, you'll take longer and your products are more expensive so you can't really penalise your customers for that... instead, perhaps look to potentially earn less at the beginning and once your work is up to a high standard, charge appropriately and look to earn back for those early finishes you did for less money! I don't know if this is suitable for everyone but it's how I've tended to operate.

If your skills are in the illustrative part of the process - the snake... you might want to collaborate with a refinisher and elevate the quality of your work that way. It's common for artists with no specific refinishing background to collaborate with refinishers and get excellent results...

Here are a few...

https://colecoatingsworkshop.com/older-entries#/saffron-x-phil-ashcroft/
https://colecoatingsworkshop.com/older-entries#/dunn-x-spoon/
https://colecoatingsworkshop.com/older-entries#/illustrated-cannondale/
https://www.quinntessentialcustomsworkshop.com/recent-work/illustrated-sworks

I hope that isn't too blunt and offers you the insight you need.