Nic, thanks for pointing out the thumb. Bettering it I noticed the hammerhead wasn't placed correctly too. The Tower still doesn't feel right to me but I can't lay my finger on it.
Been working on the Ace of Wands, it also stands for creativity, so I've given him a very creative saddle
On your image, be careful with over detailing her wardrobe. At this point I can hardly see what she's doing with her arms. I guess they're hanging straight against her body. Her whole attitude feels a little stiff, maybe letting her hold the spear or let her point at the viking would be an option. On the horn I would say it could be a little smaller and more diagonal hanging on her back.