As a general rule, foreground should be more detailed and background should be less. Things that are further away have less definition in our eyesight and things closer up have more. If they're RIGHT UP ON US they might blur out of focus a little, but I'm not sure if you want to go that far.
The bright yellow of the background isn't really working though I think, I'd fade that out some into more of a parchment color so it has a more storybook feel to it.

Looking good! My only crit is an echo of taylor, work on the reflection some so the form of his leg stays visible

Looking at that foliage on the previous tree i think you had something therr. Try working on some background foliage and try to tilt it more towards the camera!
The new ones good as well,  same crit though.

Aye, I usually count the waist as part of the torso and measure by the legs instead specifically to avoid this kind of thing!