I suppose this is okay, but I would not call it epic. This is only one sprite, you need too show more examples if ya;ll want too be called epic.
It's good you are fusing some "Easy" pokemon- most people try to cram as many in too try too make it too impressive. But I feel you haven't really added enough of Mismagius. Apart from the recolor, there isn't much of her. I would try to have incorporated the jewel on her chest onto the head, or the chest of the splice. The wing of the final splice needs a lot of work- the one we can see the most is just "put" there- there's not attachment on the side, nor has it been recolored. It's best too stick too recoloring 1 pokemon, then splicing it with the one you want, as if you take 3 pokemon with completely different color schemes, it can get messy. Also, the back wing on the splice is a bit iffy- it looks funny as you cannot see it properly because of Girantinas head. I would suggest actually doing the wing yourself by hand- it's easy to copy the style of sprites that pokemon are done in. The middle stripes of the spilces look wrongly shaded as well- tbh, they don;t really do anything for the sprite, imo, I would get rid of them. I also think you could easily put Girantinas legs on the splice, and edit Salamances tail to suit it's height. Otherwise, it's okay, the shading is alright, and it's nice too see more Mismagius being used n_n*.