Maybe you need to change the colours of the grass a bit, it is very yellowish now, and usually it's bright green in spring. Heh especially here in northern-ireland

There are some small anatomy errors in the characters, see www.saveloomis.org for a anatomy book that has good tips to draw poses.

For the rest, i really like it, the poses are natural and the composition is nice

Two cents more: A bigger problem than the grass (which can be "bronze" just due to the chosen color scheme or intended time of day) is the uniformity textures. Lack of textures, even. I can't tell the cloth from bark from skin (or fur, whatever they are supposed to have), and even the grass has the same waxy quality.

Your next exercise: practice painting materials so they look like these materials. Hint: look at the reflective properties first, especially the highlight color and sharpness.

Studying still life paintings by old Dutch masters would help, theyt were unbeatable at material textures.

Thanks for the criticism, both of you. Now I've got lots of things to work on in the near future
(texture a lot more than anatomy ... I think I've never really thought about really studying textures till now)

@jawine: Northern Ireland? I'll go on holidays to Ireland in a month, sooo much looking forward to it. Always loved the isle, had just never the chance to visit it.