Overall a great start.
1. All underexposed by 1/3 to 2/3 of a stop or more.
2. Avoid harsh light, the brown cookie photo. use a sheet or reflector to create soft light.
3. Adjust your color balance to be consistent. The images are too warm
4. Depth of field looks OK, play with your focus plane some and pick the best ones.
5. bump up your clarity, maybe?
I want a desert now.