These are gorgeous! The landscape is especially nice. :D Bougereau's a hard one to copy, I admire your bravery haha. One thing I'd mention is that some of the halftones are getting a little dark in your figure, especially with Boog's style, he often uses extremely tiny value shifts coupled with a slightly more exaggerated temperature shift to turn forms in his halftones, keeping them all extremely tightly grouped as a shape. The only major value shifts tend to happen in the shadow areas, which are also fairly grouped, and you can probably darken some of your reflected lights to match. Overall a really successful study, just something to keep in mind and watch out for!