i agree with theo- the grass look a bit fake and and little patch of rocky area doesnt blend in, i try to avoid this so i cant help with blending flock and sand. but the grass try using a few different colourd flock and add some long grass in areas when you would think it would be growing. like between the wood blocks and around the back of the wood.
Everything looks fine except for the grass, which appears to be painted gravel.
Tey using model railroad flock, and maybe putting some long grasses around the edges of the wood.
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