Nice stuff over the past month. You're definitely making progress on your blocking in.
Watch your colours. Most of your colour work has a bit of a washed-out look. Two things to look for - first, warms and cools, the highlights and shadows on objects generally won't be the same temperature, and leaving them as such flattens things out a little, makes them look less natural. Second, shifts in saturation. Those last for studies all look very mid-range. While colour-picking is generally a bad way to study, don't be afraid to do so to check your work, just to see how far off you were. It helps to understand how you're misperceiving, and why.