Blue Fusion, your art work is indeed fabulous! But MoonGypsy gave you some fantastic and absolutely correct advice. The Lennies, when laid out in an entire spread, need to have the card symbol immediately pop out from the background, or it is very difficult to look at and read smoothly and fluently!
I have some busier decks, and can only use them for three card dailies...when they are grouped together, as a whole, I am completely lost in visual stimuli!
I would also say that though the Roman numerals suit your style beautifully, many of us have a hard time making the leap from tarot to Lenormand, which is completely different as a reading system...the Roman numerals are very reminiscent of tarot, and may hold the reader's mind in the tarot zone...I don't know, just a personal observation.
But in the end, as MoonGypsy so accurately noted - it is your creation, your art, and while it is good to get suggestions, you have to weigh that against your personal "art boundaries" - you don't want to lose your initial drive and creative idea in a wash of opinions (all of which are likely to differ, in any case!)
You have a great idea there - and amazingly talented art to match
I wish you all the pleasure and luck of creating your deck!