for a first flash, this is great!
if this wasnt your first flash id give it a 1 maybe 2 tops /5 but seeing as it is your first flash your probably not as good as the guys that hit top 50 all the time soo yea great job man! 4/5 for you and hope you continue with your work!
hint: try shading like using a darker colour on edges. it makes it not look like it was done in paint.