Sick design! Love the style and the coloring. A profesional concept art I would say
The mix between frog and (dinosaur, crocodile?) looks so natural and fits in perfectly with the game's look
About the knight, suprisingly clean lineart and a pretty cool design on both the sword and the helmet. I don't really like the dots on the frog-based armor, idk it looks off comparing it to the rest of the img.
The color palette is really pleasing, with a good use of saturation on the frog's eye to catch the viewer's attention.
The soft background and the scribbled anotations are the icing on the cake.
5 outa 5