Monster; Owlgriffon

So, this is not something you will see often on the Blog, as my drawing pad and the PC stopped co-operating for a while now, and right now I don't have the budget to invest in new hardware, but I made this some time ago, it's only a sketch, but it's better than nothing. Owlgriffon, with stats below...

Owl griffons are the northern cousins of the Common Griffon. The upperbody of an owl griffon resembles a snowy owl, supplemented with the hind part of a snowleopard. The owl griffon, unlike its southern relative, prefers to stalk its prey silently, and then ambush it swiflty and silently from the air. The owl griffons smooth feathers on its wings allow it to glide almost completely without noise, making the attack truly a surprise.
Owl griffons are slightly smaller and more agile than the Common Griffon.

Owlgriffon
Large monstrosity, unaligned

Armor class 14
Hit Points 52 (7d10 + 14)
Speed 30 ft., fly 80 ft.

STR: 15 (+2)
DEX: 18 (+4)
CON: 14 (+2)
INT: 2 (-4)
WIS: 13 (+1)
CHA: 8 (-1)

Skills: Perception +5, Stealth +6
Senses: Darkvision 60 ft., passive Perception 15
Languages: -
Challenge: 2 (450 XP)

Keen Sight: The Owl Griffon has advantage on Wisdom (Perception) checks that rely on sight.
Smooth feathers: The Owlgriffon has advantage on Stealth (Dexterity) checks it makes during flight.
Aerial Ambush: If the Owlgriffon attacks from stealth, it deals an extra 3d6 (10) damage.

Actions:

Multiattack. The Owlgriffon makes two attacks, one with its beak and one with its claws.

Beak: Melee weapon attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage
Claws: Melee weapon attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) piercing damage