Examples of success...
I once asked a successful Tarot reader how to make a small fortune in the Tarot business. Her reply was ... (see below)
There are some decks which are Thoth based and have more illustrated pips. "Tarot of the Spirit" and the "Haindl Tarot" to name two that have done well.
As for her reply about making a small fortune in Tarot, she said to start with a large fortune
.
Joking aside, those decks which do well tend to reflect dedicated work over time by the artists.
I don't think Lady Frieda Harris or PC Smith saw much financial gain from their work. With the greater popularity of Tarot in a mass market with swift, international distribution, there is more potential now.
There are people on this forum with actual experience who could give you better advice than I could. If I were doing this, I would seek their advice directly.
Having made my lack of direct qualifications clear
, I suggest using the advice of those with experience to approach the major publishers. Failing that, I would create a limited edition and see if it sells well. You will need to become your own marketing and sales agent. If it does well, re-propose to the publisher with your evidence of sales.
There are a lot of Internet resources you can use to promote your cards, as well as craft fairs, specialty shops, psychic fairs, etc. It's all about how much you want to put into it.
For an example of a deck that has done very well, I suggest looking at the Deviant Moon. It is RWS based, but Patrick has done a number of interesting things.
1. Strong artistic vision.
2. Published with US Games
3. Available at B & N stores (a sign of deep penetration in standard retail with a huge chain that is NOT specialized)
4. Presence on this forum and in other places on the Internet.
5. Sells customized special editions direct to customers and has built a very personal relationship.
He could not have done this without a great product, but he has added great vision in marketing to it. This deck has only been out a few years.
In my decidedly NOT professional opinion, low resolution scans are a great way to create buz without making files that can be used for printing cards available.
Best of luck with this.