I quite like that lamp but not there. It seems to me that the table and most of the decor on it runs to "rustic." Since that's the case, I think a more sophisticated look might work well. Here are some ideas (though I encourage you to go with what you love):

https://www.wayfair.com/lighting/pdp/everly-quinn-teesha-26-table-lamp-eyqn5236.html?&experiencetype=2&selectedvertical=7

https://www.houzz.com/products/azteca-table-lamp-prvw-vr~50326684

https://www.houzz.com/products/metal-table-lamp-antique-gold-finish-225-prvw-vr~94903670

https://www.houzz.com/products/uttermost-trigolo-lamp-bright-gold-prvw-vr~127218780

https://www.houzz.com/products/renwil-pandora-table-lamp-copper-prvw-vr~42925499

https://www.houzz.com/products/mills-modern-classic-gold-acrylic-sphere-table-lamp-prvw-vr~54836392

https://www.houzz.com/products/portable-1-light-table-lamp-2-toned-gold-firenze-mixed-prvw-vr~28972121

https://www.wayfair.com/lighting/pdp/decorators-lighting-rockport-20-table-lamp-dlig1041.html?&experiencetype=2&selectedvertical=7

https://www.onekingslane.com/p/4191192-crescent-table-lamp-antiqued-gold.do?refType=&from=Search

https://www.onekingslane.com/p/3263636-modern-balustrade-table-lamp-crystal.do?refType=&from=Search

https://www.frontgate.com/greta-table-lamp/922870?listIndex=5

https://www.frontgate.com/ellery-table-lamp/1217859?listIndex=14

Swap the flowers and the B so that the two tallest items are flanking it. Then rotate the mirror so it's horizontal. The lamp looks okay, a little short but fine for now.

I think the lamp looks a little small for the length of the table. I would have equally tall things on both ends. Agree with Sina that making the mirror horizontal would be worth a try.

And maybe group the B, welcome sign and a candle (3 things) together in the center.

The style of the lamp works but I would go with a taller version.