Is this good vegan meals plan?

All the things you're eating are healthful choices from what I can see. For many people, several smaller meals is indeed a better choice for them than three larger ones. If you find that you are continually hungry and cannot seem to get "full", I would look REALLY closely at that vegan diet then, and if you additionally find you are cold in the winters and cannot seem to get and to stay warm, be aware that these are very clear, very concise messages from your body that you need both more protein, and more warming foods. If you find you are dreaming about things like eggs, cheeses, mushrooms, Brewers' yeast, this is your body's only way to tell you it needs you to look at widening your diet. If you should get thrush or yeast infections, my answer is the same, only MORESO, as your diet is all carbs w/ only a little, teeny bit of fats and proteins. Additionally, should you be hypothyroid (low thyroid), soy milk and other soy products are NOT good choices as they will depress your thyroid function even more. I'm seeing a need here for more beans and more whole grains. Were it me, I'd add some avocado to the salad(s), some sprouted beans or seeds, some tofu or tempeh or seitan. I also see an unfilled niche for things like squashes and yams and pumpkin--heavy Vitamin A as Beta-carotene foods. You did well w/ the carrots, cucumbers and yellow pepper salad, and the spinach/red lettuce/celery root/turnip/diced tomatoes/sunflower seed/vegan salad dressing salads!!! Good for you!