I like it leaning. If hanging I would hang about 5" above the table. You don't want it to look like it's hanging in mid-air. It should relate to the table

IMO You've got plenty there now. No need for any more stuff. Your tables are very pretty - keep them as is.

Just didn’t know if a person should do a lamp on both tables and same on each table or not

Personally I would hang the art and have the table tops empty

Here is my advice for lighting: At minimum - a table lamp or wall sconce in each corner at chest height. I personally don't like ceiling lights for the living room, but your higher ceilings make that a different story. I put in top HOUZZ search box - "lighting for living room with 11 eleven foot ceilings photos" and here is the link for ideas: https://www.houzz.com/photos/query/lighting-for-living-room-with-11-eleven-foot-ceilings/nqrwns

Mount the art about 5" or 6 " above the chests. I think it's better to have different items rather than matching ones in a room like this, like your lamp on one and vase on the other. Were you thinking of picture lights or a separate sconce?

I didn’t know which one would look better over picture. What would suggest

What is the purpose of the sconces? Do you need more ambient light in the room? I don't really see sconces working on the fireplace wall, but you could use a simple picture light attached to the art. If you need more light, you could use two larger lamps on each chest, use two buffet lamps on the sofa table behind the sofa, add a floor lamp to the other side of the room, or replace your fan with a better light fixture. Lots of options that would be better than sconces on that wall.

You might want to consider a picture light over your artwork

We do think hanging the pictures would be a good idea. See our design below to see how we hung artwork next to a fireplace. Also note the lights in the second image, perhaps those would work well for you over the artwork.

Luxe Living in Zionsville · More Info

Luxe Living in Zionsville · More Info

they should be hung around this height

You could do taller pieces there too.

I also think that tile should stop at crown level and the crown should be straight across.

the way you currently have it, run into the ceiling, makes it look abnormally tall and out of proportion. If you had taller ceilings I think you could get away with it.

tried to find similar fireplaces

I did find this one w/out the crown, but it's a taller ceiling and there is a drop ceiling over that portion. however, notice the art pieces on either side and how tall they are

Some people prefer symmetrical arrangements because that's the way our brain works, but I've found that introducing a least a bit of asymmetry makes a design look more interesting.