Hi do check your colors... #2 and #3 is severely on the yellow side.
The food looks unappealing and off putting because of it. Take note of your background also. Is that a book in the bg in #3?
Hi! I enjoy snapping a few shots before I eat my food too. I'm still very new to this but some things I find helpful:
1. Take a picture of a white napkin/serviette and use it to set the white balance.
2. Choose a seat near the window if there is natural light.
3. If restaurant is dark, snap A LOT of pictures, and if you're lucky, you'll get a decent one.
Agree with the comments made... too yellow.. think WB is off.. and have to look awhile before realising what the food is.. first dish is fish if i not wrong... second one i had no idea it was a mushroom hahahaha ;p