Well I will give an opinion that is a tad more detailed (apologies for that last one).
There are 3 pieces of art here that strike my eye in particular;
The color & spacing in this is done extremely well.
The fawn itself is at a realistic size, & is overall rather done well.
The coloring is done rather well in the area around the fawn, as well as individual strands of hair on it, itself.
If I was to critique any aspect, it would be a lack of detail on the nose/mouth area, but even without that, it is very nice.
The art itself is done rather well.
The cups dimensions are a tad strange (the extension outwards on the left side in particular), which looks rather whimsical (odd, but nice), but the bird is what interests me.
I can imagine this bird, as an actual bird, would be rather gorgeous.
However, the look in its eyes is rather terrifying.
It has a sort of blank stare, something that I have never seen in pet birds of mine over the years, even when they're at their worst.
It makes this piece overall rather, unsettling, but in a way that is genuinely interesting.
3 things for this painting in particular.
It seems rather happy, overall that is.
A happy little Swablu flying alongside an Altaria (I imagine it is its mother), with "something" (to my great shame, I have no idea if that is a Pokèmon or not) riding along it.
It seems rather quaint, specifically due to the balloons.
The balloons also make the entire piece, look like a stand-still from some family outing, very happy in my mind.
Alongside that, the shading is wonderful alongside Swablu's & Altaria's (cotton?).
Overall I'd say your strong points in these pieces; are the unique faces & manners of shading you do.
What you need work on; well I am unsure if each of these pieces is meant to convey an emotional message on their own, or will eventually become part of an entirely filled background. As is, they convey very interesting messages, but if you do plan to do backgrounds in more detail, than I'd say that is something to be seen.