This review was done on behalf of the "Invalid Item"  .
Overall impression: The overall plot of this first chapter was very charming and intriguing. I liked the innocent relationship of these two forbidden lovers. And I was enchanted by the magical setting. I think this is a very promising beginning which I imagine will take you on your own adventure in learning what you characters would like you to write next 
Some praise: You had some beautiful phrases throughout this chapter which literally took me into your world for a moment or two. Some of these were:
The couple raced through a lush green forest and burst out the other side of the trees onto a vast open plain. To anyone else, it was just a flat, dead grassland in which anything of color or beauty had long ceased to grow. But Mickel and Sirila knew better.
Sirila looked skyward, raised her hand high above her crowned head, and shouted, "Fly to me, my pretty winged one!"
“the roses bloomed as bright as a thousand jewels glittering in the sunlight. It was not difficult to see why Sirila had nicknamed this magical meadow "Pink Ocean." Nice job!
Pearl the pegasus tossed her head and her light blue mane shook. She touched her silver horn to the ground and instantly the air around her began to gleam. A swirl of light appeared in the center of the dry grass plane, small at first and then rapidly growing to cover the whole area.
They lay there that day, embedded by shocks of pink and scarlet and cream, staring up at the cerulean horizon, fingers intertwined in the lush green grass between them.
Things to consider: I thought your descriptions were whimsical and I got a good impression of the setting. However, sometimes the wordiness of them distracted me from your characters. This is something I tend to do too. The trick is to keep it simple, with just enough descriptors to make an impact. I would just take another swipe at it and decide which ones are really the grabbers.
Her long, softly curling light brown hair and sparkling green eyes shone especially bright today. Perhaps it was the way her silver princess tiara glimmered in the sun and contrasted against her cinnamon colored locks.
Too much description of the hair makes this paragraph a little overdone. Tighten up the writing by describing her hair one time only. I like the “cinnamon-colored locks”. A nice, fairy-tale description.
a tail the color of a pale blue rushing river
There are too many descriptors here. In the end, your beautiful imagery is dulled. Pick one or two really dramatic descriptors. (ie: a tail the color of a winter creek). I’m not sure that a rushing river is pale blue. I’d check this out. Otherwise, you also have the option of finding out the exact name of the shade of blue. Crayola crayons have some pretty neat shade names. 
Techie things
cerulean blue
Repetition – cerulean is a shade of blue, so you don’t need to say “blue” again.
This was the time when a blue jay may have flown along side a creamy Pegasus
“alongside” is one word.
And so, with that said, we begin our tale. Once upon a time...
Just a personal preference. I don’t think it’s needed here.
It was a brilliant, glowing day in
 Paragraph breaks sporadic and a bit distracting. Skip a space every time there’s a new paragraph or a new speaker.
Her long, softly curling light brown hair and sparkling green eyes shone especially bright today
Already established in your intro paragraphs that this was far, far in the past. More accurate to say “that day”.
A bit of repetition: “Mickel, you know perfectly well why. My father is the king of Dertrayg. I am princess. He hired you as a stable boy when you were six years old out of pity for your starvation. And since long before we came about this world, it has been considered preposterous for two people of as different situations as we to even converse,” Sirila answered flatly.
 This paragraph does a better job at describing the relationship between the two as well as their reason for keeping their relationship secret. A few paragraphs before, this was described again. I don’t think that preliminary paragraph is needed. It would read better without learning the same thing twice.
In all, I think this is a promising start. I did enjoy the story!
Keep on writing! And we hope to see your next chapter soon.
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