This is a really nice drawing. I like the way you Cadence was drawn. She looks young, happy, and free minded and the beach that she's on reflects that. I do kind of wish the shadow of her on the rock was slightly more visible and the ball had a bit of a brighter shine from the reflecting sunlight, but other than that, it's brilliant. The water looks a little off, some of the waves look disconnected from the actual ocean or just little out of place and it could be a bit of a lighter, shinier blue considering the sky is clear and the water should be shimmering, but that's my opinion. I would've liked to see some small wave breakage on the rocks and glistening spray from the breaking waves around her to add to the bright mood, but that's an optional effects touch. 9.5/10!
going to be a bit nitpicky here, but I love the colour choice & how is bright & gives off a happy aura. one thing that bugs me, however, is that while everything else has selective outlining, cadence has black outlines on every part of her body, making her look like she was inserted into a separate picture rather than actually being a part of the image - the legs & the rock don't help either, as the rock should be flatter/her legs more steeply raised. given how smooth everything else is, it is a tad odd that the hair should bend at angles rather than being smooth. the shading on the fur & feathers should gradient to a more dark reddish hue rather than desaturated purple, but that is more opinion than a criticism. the eyes also seem a tad dull, being shaded darker & desaturated instead of darker & more colourful. altogether, wonderful piece, nicely & professionally done.
First, I use a brush with a fuzzy edge for painting and smudging of the shading. It looks like watercolor. You can see it here: [link]
The second part is that I have overlayed the whole image with a grainy paper texture that (through a setting in the options of that layer in Photoshop) is only visible on darker parts and invisible on bright parts of the image.