Wow, this is very nice. I like it very much That tree is actually REALLY good, better than me any day lol
Alrighty, on to business~
Vision: Very bliss and soothing thoughts come to mind when I saw this. I wish I could find a nice grassy field and nap with bathing in the warm sunset like Tails is.
Originality: You know what's funny? I often see a lot of Sonic fan artists drawing Tails relaxing in one way or another whereas ironically to Sonic TEAM, he is such a busybody in the video games. It's always nice to see a different of a character ^_^ Big plus on your side for that~!
Technique: The soft brushing really adds to that 'dreaming' feeling in this picture and the colours couldn't be more correct. You have a good sense of light-sourcing. A tip would be to make the grass and the leaves of the tree have an orange tint since the sky has one. It would add A LOT more warmth to the picture.
Impact: Nevertheless. I really like this picture, it makes me want to have a break at whatever I'm doing right now and soak in the sun rays