Hello Your work has been featured as one of #Birds-Club's top art submissions for the month of August. You can find the article which also contains other beautiful bird art here: [link]
I'm not sure about size, but you can tell from the thickness of the neck, the size of the bulge on their head and the way they hold their wings. Males have a thicker neck, a bigger bulge and often hold their wings high to impress the females
I think it's a male, though. Males typically hold their wings high