This is one of my favorite Mickey pencils. Great character, large image, good expression and representative of one of the key moments as Mickey starts to exert his "power."
Mickey Pencil (click to enlarge)
Here is a similar image from the Disney web site. Frankly, I like the pencil that we have -- a little more facial expression and I like the hand/finger positioning...
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From Fantasia (1940), the Sorcerer's Apprentice sequence. Excellent pose of Mickey in full apprentice costume. Hands outstretched. Looking over his right shoulder with a grin. Hat slightly bent. Stu thinks this is one of the best images of Mickey he's seen. [9.5”W x 7”H] SeqID 0039
Reference: In the WD Fantasia book, there is a cel almost identical featured on page 89. Also very similar image on the Disney web site.