Welcome back raptor x) glad youre finally going on digital. His pose and expression is working but i think you need to check the shape of his pecs and abs with some references. his right pec looks too round and the first row of his abs look too long vertically. His right thigh also looks like its bone is curving, but i don't know if its a deliberate stylistic choice. I've never done art on ipads so I have nothing to offer there unfortunately. good luck for the coloring 
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