First of all thanks for valuing my opinion.
One big style issue I see right away is the roof inconsistency. When an architect designs multiple structures like you've done here they generally keep them the same. I would either give the house the fancy scale look (my recommendation) or make the pitch on the shed the same evenness with the house.
The next thing I notice is that the accents on the windows are round but the rest of the structure is completely square. I would either spice things up a bit by rounding things like the porch corners or go completely rectangular.
The last thing I noticed were that the steps coming off the porch were random colors.