The flower field means nothing on its own, it's just a dreamy background, and any symbolism you might find in it would be forced, it's just artistic choice and nothing more.
Praise is what Torulf wants - he didn't get enough love when he was younger and now he feels like the world owes him all the love he can get his paws on, no matter who gets hurt in the process, since in his eyes, its his to take, with nothing owed in return. He wants, he NEEDS for people to want him, to crave him, to love him.
Torulf is a horrible person who hurt himself in his shallowness, and is now trying to drown his own fear of coming to terms with his reality by piling young bodies on it.
BTW, this is pure assumption, but since the author has been so thorough when writing Torulf, I imagine I can make it. Torulf is coming on to Arvo so hard precisely because Mikko rebuffed him. You can' imagine how hard it hurts people like him when someone doesn't want them, it's a knife wound on their world - someone dares to keep from him what he deserves, something that he imagines he owns, and there's nothing he can do about it. So of course he rushed to put another body onto the pile and fuck Arvo - he needed to distract himself from the defeat.