nisaba
On purely visual terms, a number of very different decks do it for me. The KissaTarot has a mysterious, dreamlike quality, and a great colour-palette. The Vetrate is stunning. The Lebanese has a delicious high-art feel.
If you like fairly simple imagery check out the Badger's Forest Tarot. It is such an individual thing, what visual imagery inspires a person's intuition. I find Nakisha's artwork very soulful and simple imagery might give your intuition a chance to kick in without getting drowned out by a lot of complex ideas or a system of symbolism or mythology.
If you like animals, Pagan Cats is pretty, imo, and it speaks very gently but very clearly.
Myself one of my favourite decks is the Daniloff, but you might find it pricey. Reads clearly and easily, with quirky art, but not overly detailed pics.
Art in a deck is such a personal matter. When I first began collecting decks, I went to Tarot Garden website, and strolled through a ton of decks there, as well as to the cards link here; or I would go to Amazon and just type tarot decks in the search bar. If I saw a deck I thought I would like, I would then look it up on Google images to see more of the cards Using that technique, I was able to find and get many decks that I love and use, and am not disappointed with.
Good luck!
ETA Tarot Illuminati is rich, detailed, pretty, a breeze to read, and has a ton of gorgeous horses in it
for me its The Wild of unknown tarot..so simple....yet so complex..
It gives clear and loud messages! I love it
I second the Illuminati- one of the few decks that was instantly readable directly out of the box. It is seamless, unbelievably easy to read- it comes so effortlessly that I was comfortable reading for others the day I received it- which is not common.
http://www.aeclectic.net/tarot/cards/illuminati/
The only other one I ever had that was easy like that would be the Crystal Visions. Completely different art work- not something I would have even seen myself liking, but it reads so incredibly well that it will stay a part of my collection.
http://www.aeclectic.net/tarot/cards/crystal-visions/
I started a thread once- asking people for their top picks of "easy reading" decks, you may want to check it out as well for alternative ideas.
http://www.tarotforum.net/showthread.php?t=189402
Many had mentioned the Cosmic- which I purchased but ended up getting rid of as it didn't work as well as the two I mentioned and the art wasn't enough for me to keep it- but it may work better for you.
Hopefully that helps a bit.