Work lightly with your tints - you should be delivering color not drawing - work from edge to edge - your pencil strokes should follow the shape of the subject

Establish a light source - it can be anywhere but it needs to remain constant - include cast shadows - work from shape edges - be sure to make transitions

Try mixing your analogous colors before adding them to your page - analogous colors add depth and warmth to your work. The sample above is not yet complete - try your own sample using any two sets of complements - when your work is finished the shape outlines should no longer be obvious - contrast is greatest next to an edge.