Platformer W.I.P

[Timpa]

I'm currently helping a friend with his platformer and I would like some critique since I havn't really done this kind of pixelart before.

The rock base for houses.

The standard grasstile

The woodbase for houses


and just a quick mockup of how it probably would look


So, any suggestions?

[TrevoriuS]

Here be some keyframes of the player that goes with this game:

Also you should know that I still dislike the plainness of the grass So here's a variation; convince me if it's better. This community can be the judge